/*!
 * Vue.js v2.6.12
 * (c) 2014-2020 Evan You
 * Released under the MIT License.
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
        (global = global || self, global.Vue = factory());
}
    (this, function () {
        'use strict';

        /*  */

        var emptyObject = Object.freeze({});

        // These helpers produce better VM code in JS engines due to their
        // explicitness and function inlining.
        function isUndef(v) {
            return v === undefined || v === null
        }

        function isDef(v) {
            return v !== undefined && v !== null
        }

        function isTrue(v) {
            return v === true
        }

        function isFalse(v) {
            return v === false
        }

        /**
		 * Check if value is primitive.
		 */
        function isPrimitive(value) {
            return (
                typeof value === 'string' ||
                typeof value === 'number' ||
                // $flow-disable-line
                typeof value === 'symbol' ||
                typeof value === 'boolean')
        }

        /**
		 * Quick object check - this is primarily used to tell Objects from
		 * primitive values when we know the value is a JSON-compliant type.
		 */
        function isObject(obj) {
            return obj !== null && typeof obj === 'object'
        }

        /**
		 * Get the raw type string of a value, e.g., [object Object].
		 */
        var _toString = Object.prototype.toString;

        function toRawType(value) {
            return _toString.call(value).slice(8, -1)
        }

        /**
		 * Strict object type check. Only returns true for plain JavaScript
		 * objects.
		 */
        function isPlainObject(obj) {
            return _toString.call(obj) === '[object Object]'
        }

        function isRegExp(v) {
            return _toString.call(v) === '[object RegExp]'
        }

        /**
		 * Check if val is a valid array index.
		 */
        function isValidArrayIndex(val) {
            var n = parseFloat(String(val));
            return n >= 0 && Math.floor(n) === n && isFinite(val)
        }

        function isPromise(val) {
            return (
                isDef(val) &&
                typeof val.then === 'function' &&
                typeof val.catch === 'function')
        }

        /**
		 * Convert a value to a string that is actually rendered.
		 */
        function toString(val) {
            return val == null
             ? ''
             : Array.isArray(val) || (isPlainObject(val) && val.toString === _toString)
             ? JSON.stringify(val, null, 2)
             : String(val)
        }

        /**
		 * Convert an input value to a number for persistence. If the conversion
		 * fails, return original string.
		 */
        function toNumber(val) {
            var n = parseFloat(val);
            return isNaN(n) ? val : n
        }

        /**
		 * Make a map and return a function for checking if a key is in that
		 * map.
		 */
        function makeMap(
            str,
            expectsLowerCase) {
            var map = Object.create(null);
            var list = str.split(',');
            for (var i = 0; i < list.length; i++) {
                map[list[i]] = true;
            }
            return expectsLowerCase
             ? function (val) {
                return map[val.toLowerCase()];
            }
             : function (val) {
                return map[val];
            }
        }

        /**
		 * Check if a tag is a built-in tag.
		 */
        var isBuiltInTag = makeMap('slot,component', true);

        /**
		 * Check if an attribute is a reserved attribute.
		 */
        var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');

        /**
		 * Remove an item from an array.
		 */
        function remove(arr, item) {
            if (arr.length) {
                var index = arr.indexOf(item);
                if (index > -1) {
                    return arr.splice(index, 1)
                }
            }
        }

        /**
		 * Check whether an object has the property.
		 */
        var hasOwnProperty = Object.prototype.hasOwnProperty;
        function hasOwn(obj, key) {
            return hasOwnProperty.call(obj, key)
        }

        /**
		 * Create a cached version of a pure function.
		 */
        function cached(fn) {
            var cache = Object.create(null);
            return (function cachedFn(str) {
                var hit = cache[str];
                return hit || (cache[str] = fn(str))
            })
        }

        /**
		 * Camelize a hyphen-delimited string.
		 */
        var camelizeRE = /-(\w)/g;
        var camelize = cached(function (str) {
                return str.replace(camelizeRE, function (_, c) {
                    return c ? c.toUpperCase() : '';
                })
            });

        /**
		 * Capitalize a string.
		 */
        var capitalize = cached(function (str) {
                return str.charAt(0).toUpperCase() + str.slice(1)
            });

        /**
		 * Hyphenate a camelCase string.
		 */
        var hyphenateRE = /\B([A-Z])/g;
        var hyphenate = cached(function (str) {
                return str.replace(hyphenateRE, '-$1').toLowerCase()
            });

        /**
		 * Simple bind polyfill for environments that do not support it, e.g.,
		 * PhantomJS 1.x. Technically, we don't need this anymore since native
		 * bind is now performant enough in most browsers. But removing it would
		 * mean breaking code that was able to run in PhantomJS 1.x, so this
		 * must be kept for backward compatibility.
		 */

        /* istanbul ignore next */
        function polyfillBind(fn, ctx) {
            function boundFn(a) {
                var l = arguments.length;
                return l
                 ? l > 1
                 ? fn.apply(ctx, arguments)
                 : fn.call(ctx, a)
                 : fn.call(ctx)
            }

            boundFn._length = fn.length;
            return boundFn
        }

        function nativeBind(fn, ctx) {
            return fn.bind(ctx)
        }

        var bind = Function.prototype.bind
             ? nativeBind
             : polyfillBind;

        /**
		 * Convert an Array-like object to a real Array.
		 */
        function toArray(list, start) {
            start = start || 0;
            var i = list.length - start;
            var ret = new Array(i);
            while (i--) {
                ret[i] = list[i + start];
            }
            return ret
        }

        /**
		 * Mix properties into target object.
		 */
        function extend(to, _from) {
            for (var key in _from) {
                to[key] = _from[key];
            }
            return to
        }

        /**
		 * Merge an Array of Objects into a single Object.
		 */
        function toObject(arr) {
            var res = {};
            for (var i = 0; i < arr.length; i++) {
                if (arr[i]) {
                    extend(res, arr[i]);
                }
            }
            return res
        }

        /* eslint-disable no-unused-vars */

        /**
		 * Perform no operation. Stubbing args to make Flow happy without
		 * leaving useless transpiled code with ...rest
		 * (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/).
		 */
        function noop(a, b, c) {}

        /**
		 * Always return false.
		 */
        var no = function (a, b, c) {
            return false;
        };

        /* eslint-enable no-unused-vars */

        /**
		 * Return the same value.
		 */
        var identity = function (_) {
            return _;
        };

        /**
		 * Generate a string containing static keys from compiler modules.
		 */
        function genStaticKeys(modules) {
            return modules.reduce(function (keys, m) {
                return keys.concat(m.staticKeys || [])
            }, []).join(',')
        }

        /**
		 * Check if two values are loosely equal - that is, if they are plain
		 * objects, do they have the same shape?
		 */
        function looseEqual(a, b) {
            if (a === b) {
                return true
            }
            var isObjectA = isObject(a);
            var isObjectB = isObject(b);
            if (isObjectA && isObjectB) {
                try {
                    var isArrayA = Array.isArray(a);
                    var isArrayB = Array.isArray(b);
                    if (isArrayA && isArrayB) {
                        return a.length === b.length && a.every(function (e, i) {
                            return looseEqual(e, b[i])
                        })
                    } else if (a instanceof Date && b instanceof Date) {
                        return a.getTime() === b.getTime()
                    } else if (!isArrayA && !isArrayB) {
                        var keysA = Object.keys(a);
                        var keysB = Object.keys(b);
                        return keysA.length === keysB.length && keysA.every(function (key) {
                            return looseEqual(a[key], b[key])
                        })
                    } else {
                        /* istanbul ignore next */
                        return false
                    }
                } catch (e) {
                    /* istanbul ignore next */
                    return false
                }
            } else if (!isObjectA && !isObjectB) {
                return String(a) === String(b)
            } else {
                return false
            }
        }

        /**
		 * Return the first index at which a loosely equal value can be found in
		 * the array (if value is a plain object, the array must contain an
		 * object of the same shape), or -1 if it is not present.
		 */
        function looseIndexOf(arr, val) {
            for (var i = 0; i < arr.length; i++) {
                if (looseEqual(arr[i], val)) {
                    return i
                }
            }
            return -1
        }

        /**
		 * Ensure a function is called only once.
		 */
        function once(fn) {
            var called = false;
            return function () {
                if (!called) {
                    called = true;
                    fn.apply(this, arguments);
                }
            }
        }

        var SSR_ATTR = 'data-server-rendered';

        var ASSET_TYPES = [
            'component',
            'directive',
            'filter'
        ];

        var LIFECYCLE_HOOKS = [
            'beforeCreate',
            'created',
            'beforeMount',
            'mounted',
            'beforeUpdate',
            'updated',
            'beforeDestroy',
            'destroyed',
            'activated',
            'deactivated',
            'errorCaptured',
            'serverPrefetch'
        ];

        /*  */

        var config = ({
            /**
			 * Option merge strategies (used in core/util/options)
			 */
            // $flow-disable-line
            optionMergeStrategies: Object.create(null),

            /**
			 * Whether to suppress warnings.
			 */
            silent: false,

            /**
			 * Show production mode tip message on boot?
			 */
            productionTip: "development" !== 'production',

            /**
			 * Whether to enable devtools
			 */
            devtools: "development" !== 'production',

            /**
			 * Whether to record perf
			 */
            performance: false,

            /**
			 * Error handler for watcher errors
			 */
            errorHandler: null,

            /**
			 * Warn handler for watcher warns
			 */
            warnHandler: null,

            /**
			 * Ignore certain custom elements
			 */
            ignoredElements: [],

            /**
			 * Custom user key aliases for v-on
			 */
            // $flow-disable-line
            keyCodes: Object.create(null),

            /**
			 * Check if a tag is reserved so that it cannot be registered as a
			 * component. This is platform-dependent and may be overwritten.
			 */
            isReservedTag: no,

            /**
			 * Check if an attribute is reserved so that it cannot be used as a
			 * component prop. This is platform-dependent and may be
			 * overwritten.
			 */
            isReservedAttr: no,

            /**
			 * Check if a tag is an unknown element. Platform-dependent.
			 */
            isUnknownElement: no,

            /**
			 * Get the namespace of an element
			 */
            getTagNamespace: noop,

            /**
			 * Parse the real tag name for the specific platform.
			 */
            parsePlatformTagName: identity,

            /**
			 * Check if an attribute must be bound using property, e.g. value
			 * Platform-dependent.
			 */
            mustUseProp: no,

            /**
			 * Perform updates asynchronously. Intended to be used by Vue Test
			 * Utils This will significantly reduce performance if set to false.
			 */
            async: true,

            /**
			 * Exposed for legacy reasons
			 */
            _lifecycleHooks: LIFECYCLE_HOOKS
        });

        /*  */

        /**
		 * unicode letters used for parsing html tags, component names and
		 * property paths. using
		 * https://www.w3.org/TR/html53/semantics-scripting.html#potentialcustomelementname
		 * skipping \u10000-\uEFFFF due to it freezing up PhantomJS
		 */
        var unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/;

        /**
		 * Check if a string starts with $ or _
		 */
        function isReserved(str) {
            var c = (str + '').charCodeAt(0);
            return c === 0x24 || c === 0x5F
        }

        /**
		 * Define a property.
		 */
        function def(obj, key, val, enumerable) {
            Object.defineProperty(obj, key, {
                value: val,
                enumerable: !!enumerable,
                writable: true,
                configurable: true
            });
        }

        /**
		 * Parse simple path.
		 */
        var bailRE = new RegExp(("[^" + (unicodeRegExp.source) + ".$_\\d]"));
        function parsePath(path) {
            if (bailRE.test(path)) {
                return
            }
            var segments = path.split('.');
            return function (obj) {
                for (var i = 0; i < segments.length; i++) {
                    if (!obj) {
                        return
                    }
                    obj = obj[segments[i]];
                }
                return obj
            }
        }

        /*  */

        // can we use __proto__?
        var hasProto = '__proto__' in {};

        // Browser environment sniffing
        var inBrowser = typeof window !== 'undefined';
        var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
        var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
        var UA = inBrowser && window.navigator.userAgent.toLowerCase();
        var isIE = UA && /msie|trident/.test(UA);
        var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
        var isEdge = UA && UA.indexOf('edge/') > 0;
        var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
        var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
        var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;
        var isPhantomJS = UA && /phantomjs/.test(UA);
        var isFF = UA && UA.match(/firefox\/(\d+)/);

        // Firefox has a "watch" function on Object.prototype...
        var nativeWatch = ({}).watch;

        var supportsPassive = false;
        if (inBrowser) {
            try {
                var opts = {};
                Object.defineProperty(opts, 'passive', ({
                        get: function get() {
                            /* istanbul ignore next */
                            supportsPassive = true;
                        }
                    })); // https://github.com/facebook/flow/issues/285
                window.addEventListener('test-passive', null, opts);
            } catch (e) {}
        }

        // this needs to be lazy-evaled because vue may be required before
        // vue-server-renderer can set VUE_ENV
        var _isServer;
        var isServerRendering = function () {
            if (_isServer === undefined) {
                /* istanbul ignore if */
                if (!inBrowser && !inWeex && typeof global !== 'undefined') {
                    // detect presence of vue-server-renderer and avoid
                    // Webpack shimming the process
                    _isServer = global['process'] && global['process'].env.VUE_ENV === 'server';
                } else {
                    _isServer = false;
                }
            }
            return _isServer
        };

        // detect devtools
        var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

        /* istanbul ignore next */
        function isNative(Ctor) {
            return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
        }

        var hasSymbol =
            typeof Symbol !== 'undefined' && isNative(Symbol) &&
            typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

        var _Set;
        /* istanbul ignore if */// $flow-disable-line
        if (typeof Set !== 'undefined' && isNative(Set)) {
            // use native Set when available.
            _Set = Set;
        } else {
            // a non-standard Set polyfill that only works with primitive keys.
            _Set = /* @__PURE__ */(function () {
                function Set() {
                    this.set = Object.create(null);
                }
                Set.prototype.has = function has(key) {
                    return this.set[key] === true
                };
                Set.prototype.add = function add(key) {
                    this.set[key] = true;
                };
                Set.prototype.clear = function clear() {
                    this.set = Object.create(null);
                };

                return Set;
            }
                ());
        }

        /*  */

        var warn = noop;
        var tip = noop;
        var generateComponentTrace = (noop); // work around flow check
        var formatComponentName = (noop);
        {
            var hasConsole = typeof console !== 'undefined';
            var classifyRE = /(?:^|[-_])(\w)/g;
            var classify = function (str) {
                return str
                .replace(classifyRE, function (c) {
                    return c.toUpperCase();
                })
                .replace(/[-_]/g, '');
            };

            warn = function (msg, vm) {
                var trace = vm ? generateComponentTrace(vm) : '';

                if (config.warnHandler) {
                    config.warnHandler.call(null, msg, vm, trace);
                } else if (hasConsole && (!config.silent)) {
                    console.error(("[Vue warn]: " + msg + trace));
                }
            };

            tip = function (msg, vm) {
                if (hasConsole && (!config.silent)) {
                    console.warn("[Vue tip]: " + msg + (
                            vm ? generateComponentTrace(vm) : ''));
                }
            };

            formatComponentName = function (vm, includeFile) {
                if (vm.$root === vm) {
                    return '<Root>'
                }
                var options = typeof vm === 'function' && vm.cid != null
                     ? vm.options
                     : vm._isVue
                     ? vm.$options || vm.constructor.options
                     : vm;
                var name = options.name || options._componentTag;
                var file = options.__file;
                if (!name && file) {
                    var match = file.match(/([^/\\]+)\.vue$/);
                    name = match && match[1];
                }

                return (
                    (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
                    (file && includeFile !== false ? (" at " + file) : ''))
            };

            var repeat = function (str, n) {
                var res = '';
                while (n) {
                    if (n % 2 === 1) {
                        res += str;
                    }
                    if (n > 1) {
                        str += str;
                    }
                    n >>= 1;
                }
                return res
            };

            generateComponentTrace = function (vm) {
                if (vm._isVue && vm.$parent) {
                    var tree = [];
                    var currentRecursiveSequence = 0;
                    while (vm) {
                        if (tree.length > 0) {
                            var last = tree[tree.length - 1];
                            if (last.constructor === vm.constructor) {
                                currentRecursiveSequence++;
                                vm = vm.$parent;
                                continue
                            } else if (currentRecursiveSequence > 0) {
                                tree[tree.length - 1] = [last, currentRecursiveSequence];
                                currentRecursiveSequence = 0;
                            }
                        }
                        tree.push(vm);
                        vm = vm.$parent;
                    }
                    return '\n\nfound in\n\n' + tree
                    .map(function (vm, i) {
                        return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm)
                                 ? ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)")
                                 : formatComponentName(vm)));
                    })
                    .join('\n')
                } else {
                    return ("\n\n(found in " + (formatComponentName(vm)) + ")")
                }
            };
        }

        /*  */

        var uid = 0;

        /**
		 * A dep is an observable that can have multiple directives subscribing
		 * to it.
		 */
        var Dep = function Dep() {
            this.id = uid++;
            this.subs = [];
        };

        Dep.prototype.addSub = function addSub(sub) {
            this.subs.push(sub);
        };

        Dep.prototype.removeSub = function removeSub(sub) {
            remove(this.subs, sub);
        };

        Dep.prototype.depend = function depend() {
            if (Dep.target) {
                Dep.target.addDep(this);
            }
        };

        Dep.prototype.notify = function notify() {
            // stabilize the subscriber list first
            var subs = this.subs.slice();
            if (!config.async) {
                // subs aren't sorted in scheduler if not running async
                // we need to sort them now to make sure they fire in correct
                // order
                subs.sort(function (a, b) {
                    return a.id - b.id;
                });
            }
            for (var i = 0, l = subs.length; i < l; i++) {
                subs[i].update();
            }
        };

        // The current target watcher being evaluated.
        // This is globally unique because only one watcher
        // can be evaluated at a time.
        Dep.target = null;
        var targetStack = [];

        function pushTarget(target) {
            targetStack.push(target);
            Dep.target = target;
        }

        function popTarget() {
            targetStack.pop();
            Dep.target = targetStack[targetStack.length - 1];
        }

        /*  */

        var VNode = function VNode(
            tag,
            data,
            children,
            text,
            elm,
            context,
            componentOptions,
            asyncFactory) {
            this.tag = tag;
            this.data = data;
            this.children = children;
            this.text = text;
            this.elm = elm;
            this.ns = undefined;
            this.context = context;
            this.fnContext = undefined;
            this.fnOptions = undefined;
            this.fnScopeId = undefined;
            this.key = data && data.key;
            this.componentOptions = componentOptions;
            this.componentInstance = undefined;
            this.parent = undefined;
            this.raw = false;
            this.isStatic = false;
            this.isRootInsert = true;
            this.isComment = false;
            this.isCloned = false;
            this.isOnce = false;
            this.asyncFactory = asyncFactory;
            this.asyncMeta = undefined;
            this.isAsyncPlaceholder = false;
        };

        var prototypeAccessors = {
            child: {
                configurable: true
            }
        };

        // DEPRECATED: alias for componentInstance for backwards compat.
        /* istanbul ignore next */
        prototypeAccessors.child.get = function () {
            return this.componentInstance
        };

        Object.defineProperties(VNode.prototype, prototypeAccessors);

        var createEmptyVNode = function (text) {
            if (text === void 0)
                text = '';

            var node = new VNode();
            node.text = text;
            node.isComment = true;
            return node
        };

        function createTextVNode(val) {
            return new VNode(undefined, undefined, undefined, String(val))
        }

        // optimized shallow clone
        // used for static nodes and slot nodes because they may be reused
		// across
        // multiple renders, cloning them avoids errors when DOM manipulations
		// rely
        // on their elm reference.
        function cloneVNode(vnode) {
            var cloned = new VNode(
                    vnode.tag,
                    vnode.data,
                    // #7975
                    // clone children array to avoid mutating original in case
					// of cloning
                    // a child.
                    vnode.children && vnode.children.slice(),
                    vnode.text,
                    vnode.elm,
                    vnode.context,
                    vnode.componentOptions,
                    vnode.asyncFactory);
            cloned.ns = vnode.ns;
            cloned.isStatic = vnode.isStatic;
            cloned.key = vnode.key;
            cloned.isComment = vnode.isComment;
            cloned.fnContext = vnode.fnContext;
            cloned.fnOptions = vnode.fnOptions;
            cloned.fnScopeId = vnode.fnScopeId;
            cloned.asyncMeta = vnode.asyncMeta;
            cloned.isCloned = true;
            return cloned
        }

        /*
		 * not type checking this file because flow doesn't play well with
		 * dynamically accessing methods on Array prototype
		 */

        var arrayProto = Array.prototype;
        var arrayMethods = Object.create(arrayProto);

        var methodsToPatch = [
            'push',
            'pop',
            'shift',
            'unshift',
            'splice',
            'sort',
            'reverse'
        ];

        /**
		 * Intercept mutating methods and emit events
		 */
        methodsToPatch.forEach(function (method) {
            // cache original method
            var original = arrayProto[method];
            def(arrayMethods, method, function mutator() {
                var args = [],
                len = arguments.length;
                while (len--)
                    args[len] = arguments[len];

                var result = original.apply(this, args);
                var ob = this.__ob__;
                var inserted;
                switch (method) {
                case 'push':
                case 'unshift':
                    inserted = args;
                    break
                case 'splice':
                    inserted = args.slice(2);
                    break
                }
                if (inserted) {
                    ob.observeArray(inserted);
                }
                // notify change
                ob.dep.notify();
                return result
            });
        });

        /*  */

        var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

        /**
		 * In some cases we may want to disable observation inside a component's
		 * update computation.
		 */
        var shouldObserve = true;

        function toggleObserving(value) {
            shouldObserve = value;
        }

        /**
		 * Observer class that is attached to each observed object. Once
		 * attached, the observer converts the target object's property keys
		 * into getter/setters that collect dependencies and dispatch updates.
		 */
        var Observer = function Observer(value) {
            this.value = value;
            this.dep = new Dep();
            this.vmCount = 0;
            def(value, '__ob__', this);
            if (Array.isArray(value)) {
                if (hasProto) {
                    protoAugment(value, arrayMethods);
                } else {
                    copyAugment(value, arrayMethods, arrayKeys);
                }
                this.observeArray(value);
            } else {
                this.walk(value);
            }
        };

        /**
		 * Walk through all properties and convert them into getter/setters.
		 * This method should only be called when value type is Object.
		 */
        Observer.prototype.walk = function walk(obj) {
            var keys = Object.keys(obj);
            for (var i = 0; i < keys.length; i++) {
                defineReactive$$1(obj, keys[i]);
            }
        };

        /**
		 * Observe a list of Array items.
		 */
        Observer.prototype.observeArray = function observeArray(items) {
            for (var i = 0, l = items.length; i < l; i++) {
                observe(items[i]);
            }
        };

        // helpers

        /**
		 * Augment a target Object or Array by intercepting the prototype chain
		 * using __proto__
		 */
        function protoAugment(target, src) {
            /* eslint-disable no-proto */
            target.__proto__ = src;
            /* eslint-enable no-proto */
        }

        /**
		 * Augment a target Object or Array by defining hidden properties.
		 */
        /* istanbul ignore next */
        function copyAugment(target, src, keys) {
            for (var i = 0, l = keys.length; i < l; i++) {
                var key = keys[i];
                def(target, key, src[key]);
            }
        }

        /**
		 * Attempt to create an observer instance for a value, returns the new
		 * observer if successfully observed, or the existing observer if the
		 * value already has one.
		 */
        function observe(value, asRootData) {
            if (!isObject(value) || value instanceof VNode) {
                return
            }
            var ob;
            if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
                ob = value.__ob__;
            } else if (
                shouldObserve &&
                !isServerRendering() &&
                (Array.isArray(value) || isPlainObject(value)) &&
                Object.isExtensible(value) &&
                !value._isVue) {
                ob = new Observer(value);
            }
            if (asRootData && ob) {
                ob.vmCount++;
            }
            return ob
        }

        /**
		 * Define a reactive property on an Object.
		 */
        function defineReactive$$1(
            obj,
            key,
            val,
            customSetter,
            shallow) {
            var dep = new Dep();

            var property = Object.getOwnPropertyDescriptor(obj, key);
            if (property && property.configurable === false) {
                return
            }

            // cater for pre-defined getter/setters
            var getter = property && property.get;
            var setter = property && property.set;
            if ((!getter || setter) && arguments.length === 2) {
                val = obj[key];
            }

            var childOb = !shallow && observe(val);
            Object.defineProperty(obj, key, {
                enumerable: true,
                configurable: true,
                get: function reactiveGetter() {
                    var value = getter ? getter.call(obj) : val;
                    if (Dep.target) {
                        dep.depend();
                        if (childOb) {
                            childOb.dep.depend();
                            if (Array.isArray(value)) {
                                dependArray(value);
                            }
                        }
                    }
                    return value
                },
                set: function reactiveSetter(newVal) {
                    var value = getter ? getter.call(obj) : val;
                    /* eslint-disable no-self-compare */
                    if (newVal === value || (newVal !== newVal && value !== value)) {
                        return
                    }
                    /* eslint-enable no-self-compare */
                    if (customSetter) {
                        customSetter();
                    }
                    // #7981: for accessor properties without setter
                    if (getter && !setter) {
                        return
                    }
                    if (setter) {
                        setter.call(obj, newVal);
                    } else {
                        val = newVal;
                    }
                    childOb = !shallow && observe(newVal);
                    dep.notify();
                }
            });
        }

        /**
		 * Set a property on an object. Adds the new property and triggers
		 * change notification if the property doesn't already exist.
		 */
        function set(target, key, val) {
            if (isUndef(target) || isPrimitive(target)) {
                warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
            }
            if (Array.isArray(target) && isValidArrayIndex(key)) {
                target.length = Math.max(target.length, key);
                target.splice(key, 1, val);
                return val
            }
            if (key in target && !(key in Object.prototype)) {
                target[key] = val;
                return val
            }
            var ob = (target).__ob__;
            if (target._isVue || (ob && ob.vmCount)) {
                warn(
                    'Avoid adding reactive properties to a Vue instance or its root $data ' +
                    'at runtime - declare it upfront in the data option.');
                return val
            }
            if (!ob) {
                target[key] = val;
                return val
            }
            defineReactive$$1(ob.value, key, val);
            ob.dep.notify();
            return val
        }

        /**
		 * Delete a property and trigger change if necessary.
		 */
        function del(target, key) {
            if (isUndef(target) || isPrimitive(target)) {
                warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
            }
            if (Array.isArray(target) && isValidArrayIndex(key)) {
                target.splice(key, 1);
                return
            }
            var ob = (target).__ob__;
            if (target._isVue || (ob && ob.vmCount)) {
                warn(
                    'Avoid deleting properties on a Vue instance or its root $data ' +
                    '- just set it to null.');
                return
            }
            if (!hasOwn(target, key)) {
                return
            }
            delete target[key];
            if (!ob) {
                return
            }
            ob.dep.notify();
        }

        /**
		 * Collect dependencies on array elements when the array is touched,
		 * since we cannot intercept array element access like property getters.
		 */
        function dependArray(value) {
            for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
                e = value[i];
                e && e.__ob__ && e.__ob__.dep.depend();
                if (Array.isArray(e)) {
                    dependArray(e);
                }
            }
        }

        /*  */

        /**
		 * Option overwriting strategies are functions that handle how to merge
		 * a parent option value and a child option value into the final value.
		 */
        var strats = config.optionMergeStrategies;

        /**
		 * Options with restrictions
		 */
        {
            strats.el = strats.propsData = function (parent, child, vm, key) {
                if (!vm) {
                    warn(
                        "option \"" + key + "\" can only be used during instance " +
                        'creation with the `new` keyword.');
                }
                return defaultStrat(parent, child)
            };
        }

        /**
		 * Helper that recursively merges two data objects together.
		 */
        function mergeData(to, from) {
            if (!from) {
                return to
            }
            var key,
            toVal,
            fromVal;

            var keys = hasSymbol
                 ? Reflect.ownKeys(from)
                 : Object.keys(from);

            for (var i = 0; i < keys.length; i++) {
                key = keys[i];
                // in case the object is already observed...
                if (key === '__ob__') {
                    continue
                }
                toVal = to[key];
                fromVal = from[key];
                if (!hasOwn(to, key)) {
                    set(to, key, fromVal);
                } else if (
                    toVal !== fromVal &&
                    isPlainObject(toVal) &&
                    isPlainObject(fromVal)) {
                    mergeData(toVal, fromVal);
                }
            }
            return to
        }

        /**
		 * Data
		 */
        function mergeDataOrFn(
            parentVal,
            childVal,
            vm) {
            if (!vm) {
                // in a Vue.extend merge, both should be functions
                if (!childVal) {
                    return parentVal
                }
                if (!parentVal) {
                    return childVal
                }
                // when parentVal & childVal are both present,
                // we need to return a function that returns the
                // merged result of both functions... no need to
                // check if parentVal is a function here because
                // it has to be a function to pass previous merges.
                return function mergedDataFn() {
                    return mergeData(
                        typeof childVal === 'function' ? childVal.call(this, this) : childVal,
                        typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal)
                }
            } else {
                return function mergedInstanceDataFn() {
                    // instance merge
                    var instanceData = typeof childVal === 'function'
                         ? childVal.call(vm, vm)
                         : childVal;
                    var defaultData = typeof parentVal === 'function'
                         ? parentVal.call(vm, vm)
                         : parentVal;
                    if (instanceData) {
                        return mergeData(instanceData, defaultData)
                    } else {
                        return defaultData
                    }
                }
            }
        }

        strats.data = function (
            parentVal,
            childVal,
            vm) {
            if (!vm) {
                if (childVal && typeof childVal !== 'function') {
                    warn(
                        'The "data" option should be a function ' +
                        'that returns a per-instance value in component ' +
                        'definitions.',
                        vm);

                    return parentVal
                }
                return mergeDataOrFn(parentVal, childVal)
            }

            return mergeDataOrFn(parentVal, childVal, vm)
        };

        /**
		 * Hooks and props are merged as arrays.
		 */
        function mergeHook(
            parentVal,
            childVal) {
            var res = childVal
                 ? parentVal
                 ? parentVal.concat(childVal)
                 : Array.isArray(childVal)
                 ? childVal
                 : [childVal]
                 : parentVal;
            return res
             ? dedupeHooks(res)
             : res
        }

        function dedupeHooks(hooks) {
            var res = [];
            for (var i = 0; i < hooks.length; i++) {
                if (res.indexOf(hooks[i]) === -1) {
                    res.push(hooks[i]);
                }
            }
            return res
        }

        LIFECYCLE_HOOKS.forEach(function (hook) {
            strats[hook] = mergeHook;
        });

        /**
		 * Assets
		 * 
		 * When a vm is present (instance creation), we need to do a three-way
		 * merge between constructor options, instance options and parent
		 * options.
		 */
        function mergeAssets(
            parentVal,
            childVal,
            vm,
            key) {
            var res = Object.create(parentVal || null);
            if (childVal) {
                assertObjectType(key, childVal, vm);
                return extend(res, childVal)
            } else {
                return res
            }
        }

        ASSET_TYPES.forEach(function (type) {
            strats[type + 's'] = mergeAssets;
        });

        /**
		 * Watchers.
		 * 
		 * Watchers hashes should not overwrite one another, so we merge them as
		 * arrays.
		 */
        strats.watch = function (
            parentVal,
            childVal,
            vm,
            key) {
            // work around Firefox's Object.prototype.watch...
            if (parentVal === nativeWatch) {
                parentVal = undefined;
            }
            if (childVal === nativeWatch) {
                childVal = undefined;
            }
            /* istanbul ignore if */
            if (!childVal) {
                return Object.create(parentVal || null)
            }{
                assertObjectType(key, childVal, vm);
            }
            if (!parentVal) {
                return childVal
            }
            var ret = {};
            extend(ret, parentVal);
            for (var key$1 in childVal) {
                var parent = ret[key$1];
                var child = childVal[key$1];
                if (parent && !Array.isArray(parent)) {
                    parent = [parent];
                }
                ret[key$1] = parent
                     ? parent.concat(child)
                     : Array.isArray(child) ? child : [child];
            }
            return ret
        };

        /**
		 * Other object hashes.
		 */
        strats.props =
            strats.methods =
            strats.inject =
            strats.computed = function (
            parentVal,
            childVal,
            vm,
            key) {
            if (childVal && "development" !== 'production') {
                assertObjectType(key, childVal, vm);
            }
            if (!parentVal) {
                return childVal
            }
            var ret = Object.create(null);
            extend(ret, parentVal);
            if (childVal) {
                extend(ret, childVal);
            }
            return ret
        };
        strats.provide = mergeDataOrFn;

        /**
		 * Default strategy.
		 */
        var defaultStrat = function (parentVal, childVal) {
            return childVal === undefined
             ? parentVal
             : childVal
        };

        /**
		 * Validate component names
		 */
        function checkComponents(options) {
            for (var key in options.components) {
                validateComponentName(key);
            }
        }

        function validateComponentName(name) {
            if (!new RegExp(("^[a-zA-Z][\\-\\.0-9_" + (unicodeRegExp.source) + "]*$")).test(name)) {
                warn(
                    'Invalid component name: "' + name + '". Component names ' +
                    'should conform to valid custom element name in html5 specification.');
            }
            if (isBuiltInTag(name) || config.isReservedTag(name)) {
                warn(
                    'Do not use built-in or reserved HTML elements as component ' +
                    'id: ' + name);
            }
        }

        /**
		 * Ensure all props option syntax are normalized into the Object-based
		 * format.
		 */
        function normalizeProps(options, vm) {
            var props = options.props;
            if (!props) {
                return
            }
            var res = {};
            var i,
            val,
            name;
            if (Array.isArray(props)) {
                i = props.length;
                while (i--) {
                    val = props[i];
                    if (typeof val === 'string') {
                        name = camelize(val);
                        res[name] = {
                            type: null
                        };
                    } else {
                        warn('props must be strings when using array syntax.');
                    }
                }
            } else if (isPlainObject(props)) {
                for (var key in props) {
                    val = props[key];
                    name = camelize(key);
                    res[name] = isPlainObject(val)
                         ? val
                         : {
                        type: val
                    };
                }
            } else {
                warn(
                    "Invalid value for option \"props\": expected an Array or an Object, " +
                    "but got " + (toRawType(props)) + ".",
                    vm);
            }
            options.props = res;
        }

        /**
		 * Normalize all injections into Object-based format
		 */
        function normalizeInject(options, vm) {
            var inject = options.inject;
            if (!inject) {
                return
            }
            var normalized = options.inject = {};
            if (Array.isArray(inject)) {
                for (var i = 0; i < inject.length; i++) {
                    normalized[inject[i]] = {
                        from: inject[i]
                    };
                }
            } else if (isPlainObject(inject)) {
                for (var key in inject) {
                    var val = inject[key];
                    normalized[key] = isPlainObject(val)
                         ? extend({
                            from: key
                        }, val)
                         : {
                        from: val
                    };
                }
            } else {
                warn(
                    "Invalid value for option \"inject\": expected an Array or an Object, " +
                    "but got " + (toRawType(inject)) + ".",
                    vm);
            }
        }

        /**
		 * Normalize raw function directives into object format.
		 */
        function normalizeDirectives(options) {
            var dirs = options.directives;
            if (dirs) {
                for (var key in dirs) {
                    var def$$1 = dirs[key];
                    if (typeof def$$1 === 'function') {
                        dirs[key] = {
                            bind: def$$1,
                            update: def$$1
                        };
                    }
                }
            }
        }

        function assertObjectType(name, value, vm) {
            if (!isPlainObject(value)) {
                warn(
                    "Invalid value for option \"" + name + "\": expected an Object, " +
                    "but got " + (toRawType(value)) + ".",
                    vm);
            }
        }

        /**
		 * Merge two option objects into a new one. Core utility used in both
		 * instantiation and inheritance.
		 */
        function mergeOptions(
            parent,
            child,
            vm) { {
                checkComponents(child);
            }

            if (typeof child === 'function') {
                child = child.options;
            }

            normalizeProps(child, vm);
            normalizeInject(child, vm);
            normalizeDirectives(child);

            // Apply extends and mixins on the child options,
            // but only if it is a raw options object that isn't
            // the result of another mergeOptions call.
            // Only merged options has the _base property.
            if (!child._base) {
                if (child.extends) {
                    parent = mergeOptions(parent, child.extends, vm);
                }
                if (child.mixins) {
                    for (var i = 0, l = child.mixins.length; i < l; i++) {
                        parent = mergeOptions(parent, child.mixins[i], vm);
                    }
                }
            }

            var options = {};
            var key;
            for (key in parent) {
                mergeField(key);
            }
            for (key in child) {
                if (!hasOwn(parent, key)) {
                    mergeField(key);
                }
            }
            function mergeField(key) {
                var strat = strats[key] || defaultStrat;
                options[key] = strat(parent[key], child[key], vm, key);
            }
            return options
        }

        /**
		 * Resolve an asset. This function is used because child instances need
		 * access to assets defined in its ancestor chain.
		 */
        function resolveAsset(
            options,
            type,
            id,
            warnMissing) {
            /* istanbul ignore if */
            if (typeof id !== 'string') {
                return
            }
            var assets = options[type];
            // check local registration variations first
            if (hasOwn(assets, id)) {
                return assets[id]
            }
            var camelizedId = camelize(id);
            if (hasOwn(assets, camelizedId)) {
                return assets[camelizedId]
            }
            var PascalCaseId = capitalize(camelizedId);
            if (hasOwn(assets, PascalCaseId)) {
                return assets[PascalCaseId]
            }
            // fallback to prototype chain
            var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
            if (warnMissing && !res) {
                warn(
                    'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
                    options);
            }
            return res
        }

        /*  */

        function validateProp(
            key,
            propOptions,
            propsData,
            vm) {
            var prop = propOptions[key];
            var absent = !hasOwn(propsData, key);
            var value = propsData[key];
            // boolean casting
            var booleanIndex = getTypeIndex(Boolean, prop.type);
            if (booleanIndex > -1) {
                if (absent && !hasOwn(prop, 'default')) {
                    value = false;
                } else if (value === '' || value === hyphenate(key)) {
                    // only cast empty string / same name to boolean if
                    // boolean has higher priority
                    var stringIndex = getTypeIndex(String, prop.type);
                    if (stringIndex < 0 || booleanIndex < stringIndex) {
                        value = true;
                    }
                }
            }
            // check default value
            if (value === undefined) {
                value = getPropDefaultValue(vm, prop, key);
                // since the default value is a fresh copy,
                // make sure to observe it.
                var prevShouldObserve = shouldObserve;
                toggleObserving(true);
                observe(value);
                toggleObserving(prevShouldObserve);
            }{
                assertProp(prop, key, value, vm, absent);
            }
            return value
        }

        /**
		 * Get the default value of a prop.
		 */
        function getPropDefaultValue(vm, prop, key) {
            // no default, return undefined
            if (!hasOwn(prop, 'default')) {
                return undefined
            }
            var def = prop.default;
            // warn against non-factory defaults for Object & Array
            if (isObject(def)) {
                warn(
                    'Invalid default value for prop "' + key + '": ' +
                    'Props with type Object/Array must use a factory function ' +
                    'to return the default value.',
                    vm);
            }
            // the raw prop value was also undefined from previous render,
            // return previous default value to avoid unnecessary watcher
			// trigger
            if (vm && vm.$options.propsData &&
                vm.$options.propsData[key] === undefined &&
                vm._props[key] !== undefined) {
                return vm._props[key]
            }
            // call factory function for non-Function types
            // a value is Function if its prototype is function even across
			// different
            // execution context
            return typeof def === 'function' && getType(prop.type) !== 'Function'
             ? def.call(vm)
             : def
        }

        /**
		 * Assert whether a prop is valid.
		 */
        function assertProp(
            prop,
            name,
            value,
            vm,
            absent) {
            if (prop.required && absent) {
                warn(
                    'Missing required prop: "' + name + '"',
                    vm);
                return
            }
            if (value == null && !prop.required) {
                return
            }
            var type = prop.type;
            var valid = !type || type === true;
            var expectedTypes = [];
            if (type) {
                if (!Array.isArray(type)) {
                    type = [type];
                }
                for (var i = 0; i < type.length && !valid; i++) {
                    var assertedType = assertType(value, type[i]);
                    expectedTypes.push(assertedType.expectedType || '');
                    valid = assertedType.valid;
                }
            }

            if (!valid) {
                warn(
                    getInvalidTypeMessage(name, value, expectedTypes),
                    vm);
                return
            }
            var validator = prop.validator;
            if (validator) {
                if (!validator(value)) {
                    warn(
                        'Invalid prop: custom validator check failed for prop "' + name + '".',
                        vm);
                }
            }
        }

        var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;

        function assertType(value, type) {
            var valid;
            var expectedType = getType(type);
            if (simpleCheckRE.test(expectedType)) {
                var t = typeof value;
                valid = t === expectedType.toLowerCase();
                // for primitive wrapper objects
                if (!valid && t === 'object') {
                    valid = value instanceof type;
                }
            } else if (expectedType === 'Object') {
                valid = isPlainObject(value);
            } else if (expectedType === 'Array') {
                valid = Array.isArray(value);
            } else {
                valid = value instanceof type;
            }
            return {
                valid: valid,
                expectedType: expectedType
            }
        }

        /**
		 * Use function string name to check built-in types, because a simple
		 * equality check will fail when running across different vms / iframes.
		 */
        function getType(fn) {
            var match = fn && fn.toString().match(/^\s*function (\w+)/);
            return match ? match[1] : ''
        }

        function isSameType(a, b) {
            return getType(a) === getType(b)
        }

        function getTypeIndex(type, expectedTypes) {
            if (!Array.isArray(expectedTypes)) {
                return isSameType(expectedTypes, type) ? 0 : -1
            }
            for (var i = 0, len = expectedTypes.length; i < len; i++) {
                if (isSameType(expectedTypes[i], type)) {
                    return i
                }
            }
            return -1
        }

        function getInvalidTypeMessage(name, value, expectedTypes) {
            var message = "Invalid prop: type check failed for prop \"" + name + "\"." +
                " Expected " + (expectedTypes.map(capitalize).join(', '));
            var expectedType = expectedTypes[0];
            var receivedType = toRawType(value);
            var expectedValue = styleValue(value, expectedType);
            var receivedValue = styleValue(value, receivedType);
            // check if we need to specify expected value
            if (expectedTypes.length === 1 &&
                isExplicable(expectedType) &&
                !isBoolean(expectedType, receivedType)) {
                message += " with value " + expectedValue;
            }
            message += ", got " + receivedType + " ";
            // check if we need to specify received value
            if (isExplicable(receivedType)) {
                message += "with value " + receivedValue + ".";
            }
            return message
        }

        function styleValue(value, type) {
            if (type === 'String') {
                return ("\"" + value + "\"")
            } else if (type === 'Number') {
                return ("" + (Number(value)))
            } else {
                return ("" + value)
            }
        }

        function isExplicable(value) {
            var explicitTypes = ['string', 'number', 'boolean'];
            return explicitTypes.some(function (elem) {
                return value.toLowerCase() === elem;
            })
        }

        function isBoolean() {
            var args = [],
            len = arguments.length;
            while (len--)
                args[len] = arguments[len];

            return args.some(function (elem) {
                return elem.toLowerCase() === 'boolean';
            })
        }

        /*  */

        function handleError(err, vm, info) {
            // Deactivate deps tracking while processing error handler to avoid
			// possible
            // infinite rendering.
            // See: https://github.com/vuejs/vuex/issues/1505
            pushTarget();
            try {
                if (vm) {
                    var cur = vm;
                    while ((cur = cur.$parent)) {
                        var hooks = cur.$options.errorCaptured;
                        if (hooks) {
                            for (var i = 0; i < hooks.length; i++) {
                                try {
                                    var capture = hooks[i].call(cur, err, vm, info) === false;
                                    if (capture) {
                                        return
                                    }
                                } catch (e) {
                                    globalHandleError(e, cur, 'errorCaptured hook');
                                }
                            }
                        }
                    }
                }
                globalHandleError(err, vm, info);
            }
            finally {
                popTarget();
            }
        }

        function invokeWithErrorHandling(
            handler,
            context,
            args,
            vm,
            info) {
            var res;
            try {
                res = args ? handler.apply(context, args) : handler.call(context);
                if (res && !res._isVue && isPromise(res) && !res._handled) {
                    res.catch(function (e) {
                        return handleError(e, vm, info + " (Promise/async)");
                    });
                    // issue #9511
                    // avoid catch triggering multiple times when nested calls
                    res._handled = true;
                }
            } catch (e) {
                handleError(e, vm, info);
            }
            return res
        }

        function globalHandleError(err, vm, info) {
            if (config.errorHandler) {
                try {
                    return config.errorHandler.call(null, err, vm, info)
                } catch (e) {
                    // if the user intentionally throws the original error in
					// the handler,
                    // do not log it twice
                    if (e !== err) {
                        logError(e, null, 'config.errorHandler');
                    }
                }
            }
            logError(err, vm, info);
        }

        function logError(err, vm, info) { {
                warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
            }
            /* istanbul ignore else */
            if ((inBrowser || inWeex) && typeof console !== 'undefined') {
                console.error(err);
            } else {
                throw err
            }
        }

        /*  */

        var isUsingMicroTask = false;

        var callbacks = [];
        var pending = false;

        function flushCallbacks() {
            pending = false;
            var copies = callbacks.slice(0);
            callbacks.length = 0;
            for (var i = 0; i < copies.length; i++) {
                copies[i]();
            }
        }

        // Here we have async deferring wrappers using microtasks.
        // In 2.5 we used (macro) tasks (in combination with microtasks).
        // However, it has subtle problems when state is changed right before
        // repaint
        // (e.g. #6813, out-in transitions).
        // Also, using (macro) tasks in event handler would cause some weird
        // behaviors
        // that cannot be circumvented (e.g. #7109, #7153, #7546, #7834, #8109).
        // So we now use microtasks everywhere, again.
        // A major drawback of this tradeoff is that there are some scenarios
        // where microtasks have too high a priority and fire in between
		// supposedly
        // sequential events (e.g. #4521, #6690, which have workarounds)
        // or even between bubbling of the same event (#6566).
        var timerFunc;

        // The nextTick behavior leverages the microtask queue, which can be
        // accessed
        // via either native Promise.then or MutationObserver.
        // MutationObserver has wider support, however it is seriously bugged in
        // UIWebView in iOS >= 9.3.3 when triggered in touch event handlers. It
        // completely stops working after triggering a few times... so, if
		// native
        // Promise is available, we will use it:
        /* istanbul ignore next, $flow-disable-line */
        if (typeof Promise !== 'undefined' && isNative(Promise)) {
            var p = Promise.resolve();
            timerFunc = function () {
                p.then(flushCallbacks);
                // In problematic UIWebViews, Promise.then doesn't completely
				// break, but
                // it can get stuck in a weird state where callbacks are pushed
				// into the
                // microtask queue but the queue isn't being flushed, until the
				// browser
                // needs to do some other work, e.g. handle a timer. Therefore
				// we can
                // "force" the microtask queue to be flushed by adding an empty
				// timer.
                if (isIOS) {
                    setTimeout(noop);
                }
            };
            isUsingMicroTask = true;
        } else if (!isIE && typeof MutationObserver !== 'undefined' && (
                isNative(MutationObserver) ||
                // PhantomJS and iOS 7.x
                MutationObserver.toString() === '[object MutationObserverConstructor]')) {
            // Use MutationObserver where native Promise is not available,
            // e.g. PhantomJS, iOS7, Android 4.4
            // (#6466 MutationObserver is unreliable in IE11)
            var counter = 1;
            var observer = new MutationObserver(flushCallbacks);
            var textNode = document.createTextNode(String(counter));
            observer.observe(textNode, {
                characterData: true
            });
            timerFunc = function () {
                counter = (counter + 1) % 2;
                textNode.data = String(counter);
            };
            isUsingMicroTask = true;
        } else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
            // Fallback to setImmediate.
            // Technically it leverages the (macro) task queue,
            // but it is still a better choice than setTimeout.
            timerFunc = function () {
                setImmediate(flushCallbacks);
            };
        } else {
            // Fallback to setTimeout.
            timerFunc = function () {
                setTimeout(flushCallbacks, 0);
            };
        }

        function nextTick(cb, ctx) {
            var _resolve;
            callbacks.push(function () {
                if (cb) {
                    try {
                        cb.call(ctx);
                    } catch (e) {
                        handleError(e, ctx, 'nextTick');
                    }
                } else if (_resolve) {
                    _resolve(ctx);
                }
            });
            if (!pending) {
                pending = true;
                timerFunc();
            }
            // $flow-disable-line
            if (!cb && typeof Promise !== 'undefined') {
                return new Promise(function (resolve) {
                    _resolve = resolve;
                })
            }
        }

        /*  */

        var mark;
        var measure;
        {
            var perf = inBrowser && window.performance;
            /* istanbul ignore if */
            if (
                perf &&
                perf.mark &&
                perf.measure &&
                perf.clearMarks &&
                perf.clearMeasures) {
                mark = function (tag) {
                    return perf.mark(tag);
                };
                measure = function (name, startTag, endTag) {
                    perf.measure(name, startTag, endTag);
                    perf.clearMarks(startTag);
                    perf.clearMarks(endTag);
                    // perf.clearMeasures(name)
                };
            }
        }

        /* not type checking this file because flow doesn't play well with Proxy */

        var initProxy;
        {
            var allowedGlobals = makeMap(
                    'Infinity,undefined,NaN,isFinite,isNaN,' +
                    'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
                    'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
                    'require' // for Webpack/Browserify
                );

            var warnNonPresent = function (target, key) {
                warn(
                    "Property or method \"" + key + "\" is not defined on the instance but " +
                    'referenced during render. Make sure that this property is reactive, ' +
                    'either in the data option, or for class-based components, by ' +
                    'initializing the property. ' +
                    'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
                    target);
            };

            var warnReservedPrefix = function (target, key) {
                warn(
                    "Property \"" + key + "\" must be accessed with \"$data." + key + "\" because " +
                    'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
                    'prevent conflicts with Vue internals. ' +
                    'See: https://vuejs.org/v2/api/#data',
                    target);
            };

            var hasProxy =
                typeof Proxy !== 'undefined' && isNative(Proxy);

            if (hasProxy) {
                var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
                config.keyCodes = new Proxy(config.keyCodes, {
                        set: function set(target, key, value) {
                            if (isBuiltInModifier(key)) {
                                warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                                return false
                            } else {
                                target[key] = value;
                                return true
                            }
                        }
                    });
            }

            var hasHandler = {
                has: function has(target, key) {
                    var has = key in target;
                    var isAllowed = allowedGlobals(key) ||
                        (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data));
                    if (!has && !isAllowed) {
                        if (key in target.$data) {
                            warnReservedPrefix(target, key);
                        } else {
                            warnNonPresent(target, key);
                        }
                    }
                    return has || !isAllowed
                }
            };

            var getHandler = {
                get: function get(target, key) {
                    if (typeof key === 'string' && !(key in target)) {
                        if (key in target.$data) {
                            warnReservedPrefix(target, key);
                        } else {
                            warnNonPresent(target, key);
                        }
                    }
                    return target[key]
                }
            };

            initProxy = function initProxy(vm) {
                if (hasProxy) {
                    // determine which proxy handler to use
                    var options = vm.$options;
                    var handlers = options.render && options.render._withStripped
                         ? getHandler
                         : hasHandler;
                    vm._renderProxy = new Proxy(vm, handlers);
                } else {
                    vm._renderProxy = vm;
                }
            };
        }

        /*  */

        var seenObjects = new _Set();

        /**
		 * Recursively traverse an object to evoke all converted getters, so
		 * that every nested property inside the object is collected as a "deep"
		 * dependency.
		 */
        function traverse(val) {
            _traverse(val, seenObjects);
            seenObjects.clear();
        }

        function _traverse(val, seen) {
            var i,
            keys;
            var isA = Array.isArray(val);
            if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
                return
            }
            if (val.__ob__) {
                var depId = val.__ob__.dep.id;
                if (seen.has(depId)) {
                    return
                }
                seen.add(depId);
            }
            if (isA) {
                i = val.length;
                while (i--) {
                    _traverse(val[i], seen);
                }
            } else {
                keys = Object.keys(val);
                i = keys.length;
                while (i--) {
                    _traverse(val[keys[i]], seen);
                }
            }
        }

        /*  */

        var normalizeEvent = cached(function (name) {
                var passive = name.charAt(0) === '&';
                name = passive ? name.slice(1) : name;
                var once$$1 = name.charAt(0) === '~'; // Prefixed last,
														// checked first
                name = once$$1 ? name.slice(1) : name;
                var capture = name.charAt(0) === '!';
                name = capture ? name.slice(1) : name;
                return {
                    name: name,
                    once: once$$1,
                    capture: capture,
                    passive: passive
                }
            });

        function createFnInvoker(fns, vm) {
            function invoker() {
                var arguments$1 = arguments;

                var fns = invoker.fns;
                if (Array.isArray(fns)) {
                    var cloned = fns.slice();
                    for (var i = 0; i < cloned.length; i++) {
                        invokeWithErrorHandling(cloned[i], null, arguments$1, vm, "v-on handler");
                    }
                } else {
                    // return handler return value for single handlers
                    return invokeWithErrorHandling(fns, null, arguments, vm, "v-on handler")
                }
            }
            invoker.fns = fns;
            return invoker
        }

        function updateListeners(
            on,
            oldOn,
            add,
            remove$$1,
            createOnceHandler,
            vm) {
            var name,
            def$$1,
            cur,
            old,
            event;
            for (name in on) {
                def$$1 = cur = on[name];
                old = oldOn[name];
                event = normalizeEvent(name);
                if (isUndef(cur)) {
                    warn(
                        "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                        vm);
                } else if (isUndef(old)) {
                    if (isUndef(cur.fns)) {
                        cur = on[name] = createFnInvoker(cur, vm);
                    }
                    if (isTrue(event.once)) {
                        cur = on[name] = createOnceHandler(event.name, cur, event.capture);
                    }
                    add(event.name, cur, event.capture, event.passive, event.params);
                } else if (cur !== old) {
                    old.fns = cur;
                    on[name] = old;
                }
            }
            for (name in oldOn) {
                if (isUndef(on[name])) {
                    event = normalizeEvent(name);
                    remove$$1(event.name, oldOn[name], event.capture);
                }
            }
        }

        /*  */

        function mergeVNodeHook(def, hookKey, hook) {
            if (def instanceof VNode) {
                def = def.data.hook || (def.data.hook = {});
            }
            var invoker;
            var oldHook = def[hookKey];

            function wrappedHook() {
                hook.apply(this, arguments);
                // important: remove merged hook to ensure it's called only once
                // and prevent memory leak
                remove(invoker.fns, wrappedHook);
            }

            if (isUndef(oldHook)) {
                // no existing hook
                invoker = createFnInvoker([wrappedHook]);
            } else {
                /* istanbul ignore if */
                if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
                    // already a merged invoker
                    invoker = oldHook;
                    invoker.fns.push(wrappedHook);
                } else {
                    // existing plain hook
                    invoker = createFnInvoker([oldHook, wrappedHook]);
                }
            }

            invoker.merged = true;
            def[hookKey] = invoker;
        }

        /*  */

        function extractPropsFromVNodeData(
            data,
            Ctor,
            tag) {
            // we are only extracting raw values here.
            // validation and default values are handled in the child
            // component itself.
            var propOptions = Ctor.options.props;
            if (isUndef(propOptions)) {
                return
            }
            var res = {};
            var attrs = data.attrs;
            var props = data.props;
            if (isDef(attrs) || isDef(props)) {
                for (var key in propOptions) {
                    var altKey = hyphenate(key);{
                        var keyInLowerCase = key.toLowerCase();
                        if (
                            key !== keyInLowerCase &&
                            attrs && hasOwn(attrs, keyInLowerCase)) {
                            tip(
                                "Prop \"" + keyInLowerCase + "\" is passed to component " +
                                (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
                                " \"" + key + "\". " +
                                "Note that HTML attributes are case-insensitive and camelCased " +
                                "props need to use their kebab-case equivalents when using in-DOM " +
                                "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\".");
                        }
                    }
                    checkProp(res, props, key, altKey, true) ||
                    checkProp(res, attrs, key, altKey, false);
                }
            }
            return res
        }

        function checkProp(
            res,
            hash,
            key,
            altKey,
            preserve) {
            if (isDef(hash)) {
                if (hasOwn(hash, key)) {
                    res[key] = hash[key];
                    if (!preserve) {
                        delete hash[key];
                    }
                    return true
                } else if (hasOwn(hash, altKey)) {
                    res[key] = hash[altKey];
                    if (!preserve) {
                        delete hash[altKey];
                    }
                    return true
                }
            }
            return false
        }

        /*  */

        // The template compiler attempts to minimize the need for normalization
		// by
        // statically analyzing the template at compile time.
        //
        // For plain HTML markup, normalization can be completely skipped
		// because
        // the
        // generated render function is guaranteed to return Array<VNode>. There
		// are
        // two cases where extra normalization is needed:

        // 1. When the children contains components - because a functional
		// component
        // may return an Array instead of a single root. In this case, just a
		// simple
        // normalization is needed - if any child is an Array, we flatten the
		// whole
        // thing with Array.prototype.concat. It is guaranteed to be only
		// 1-level
        // deep
        // because functional components already normalize their own children.
        function simpleNormalizeChildren(children) {
            for (var i = 0; i < children.length; i++) {
                if (Array.isArray(children[i])) {
                    return Array.prototype.concat.apply([], children)
                }
            }
            return children
        }

        // 2. When the children contains constructs that always generated nested
        // Arrays,
        // e.g. <template>, <slot>, v-for, or when the children is provided by
		// user
        // with hand-written render functions / JSX. In such cases a full
        // normalization
        // is needed to cater to all possible types of children values.
        function normalizeChildren(children) {
            return isPrimitive(children)
             ? [createTextVNode(children)]
             : Array.isArray(children)
             ? normalizeArrayChildren(children)
             : undefined
        }

        function isTextNode(node) {
            return isDef(node) && isDef(node.text) && isFalse(node.isComment)
        }

        function normalizeArrayChildren(children, nestedIndex) {
            var res = [];
            var i,
            c,
            lastIndex,
            last;
            for (i = 0; i < children.length; i++) {
                c = children[i];
                if (isUndef(c) || typeof c === 'boolean') {
                    continue
                }
                lastIndex = res.length - 1;
                last = res[lastIndex];
                // nested
                if (Array.isArray(c)) {
                    if (c.length > 0) {
                        c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
                        // merge adjacent text nodes
                        if (isTextNode(c[0]) && isTextNode(last)) {
                            res[lastIndex] = createTextVNode(last.text + (c[0]).text);
                            c.shift();
                        }
                        res.push.apply(res, c);
                    }
                } else if (isPrimitive(c)) {
                    if (isTextNode(last)) {
                        // merge adjacent text nodes
                        // this is necessary for SSR hydration because text
						// nodes are
                        // essentially merged when rendered to HTML strings
                        res[lastIndex] = createTextVNode(last.text + c);
                    } else if (c !== '') {
                        // convert primitive to vnode
                        res.push(createTextVNode(c));
                    }
                } else {
                    if (isTextNode(c) && isTextNode(last)) {
                        // merge adjacent text nodes
                        res[lastIndex] = createTextVNode(last.text + c.text);
                    } else {
                        // default key for nested array children (likely
						// generated by v-for)
                        if (isTrue(children._isVList) &&
                            isDef(c.tag) &&
                            isUndef(c.key) &&
                            isDef(nestedIndex)) {
                            c.key = "__vlist" + nestedIndex + "_" + i + "__";
                        }
                        res.push(c);
                    }
                }
            }
            return res
        }

        /*  */

        function initProvide(vm) {
            var provide = vm.$options.provide;
            if (provide) {
                vm._provided = typeof provide === 'function'
                     ? provide.call(vm)
                     : provide;
            }
        }

        function initInjections(vm) {
            var result = resolveInject(vm.$options.inject, vm);
            if (result) {
                toggleObserving(false);
                Object.keys(result).forEach(function (key) {
                    /* istanbul ignore else */
                    {
                        defineReactive$$1(vm, key, result[key], function () {
                            warn(
                                "Avoid mutating an injected value directly since the changes will be " +
                                "overwritten whenever the provided component re-renders. " +
                                "injection being mutated: \"" + key + "\"",
                                vm);
                        });
                    }
                });
                toggleObserving(true);
            }
        }

        function resolveInject(inject, vm) {
            if (inject) {
                // inject is :any because flow is not smart enough to figure out
				// cached
                var result = Object.create(null);
                var keys = hasSymbol
                     ? Reflect.ownKeys(inject)
                     : Object.keys(inject);

                for (var i = 0; i < keys.length; i++) {
                    var key = keys[i];
                    // #6574 in case the inject object is observed...
                    if (key === '__ob__') {
                        continue
                    }
                    var provideKey = inject[key].from;
                    var source = vm;
                    while (source) {
                        if (source._provided && hasOwn(source._provided, provideKey)) {
                            result[key] = source._provided[provideKey];
                            break
                        }
                        source = source.$parent;
                    }
                    if (!source) {
                        if ('default' in inject[key]) {
                            var provideDefault = inject[key].default;
                            result[key] = typeof provideDefault === 'function'
                                 ? provideDefault.call(vm)
                                 : provideDefault;
                        } else {
                            warn(("Injection \"" + key + "\" not found"), vm);
                        }
                    }
                }
                return result
            }
        }

        /*  */

        /**
		 * Runtime helper for resolving raw children VNodes into a slot object.
		 */
        function resolveSlots(
            children,
            context) {
            if (!children || !children.length) {
                return {}
            }
            var slots = {};
            for (var i = 0, l = children.length; i < l; i++) {
                var child = children[i];
                var data = child.data;
                // remove slot attribute if the node is resolved as a Vue slot
				// node
                if (data && data.attrs && data.attrs.slot) {
                    delete data.attrs.slot;
                }
                // named slots should only be respected if the vnode was
				// rendered in the
                // same context.
                if ((child.context === context || child.fnContext === context) &&
                    data && data.slot != null) {
                    var name = data.slot;
                    var slot = (slots[name] || (slots[name] = []));
                    if (child.tag === 'template') {
                        slot.push.apply(slot, child.children || []);
                    } else {
                        slot.push(child);
                    }
                } else {
                    (slots.default || (slots.default = [])).push(child);
                }
            }
            // ignore slots that contains only whitespace
            for (var name$1 in slots) {
                if (slots[name$1].every(isWhitespace)) {
                    delete slots[name$1];
                }
            }
            return slots
        }

        function isWhitespace(node) {
            return (node.isComment && !node.asyncFactory) || node.text === ' '
        }

        /*  */

        function normalizeScopedSlots(
            slots,
            normalSlots,
            prevSlots) {
            var res;
            var hasNormalSlots = Object.keys(normalSlots).length > 0;
            var isStable = slots ? !!slots.$stable : !hasNormalSlots;
            var key = slots && slots.$key;
            if (!slots) {
                res = {};
            } else if (slots._normalized) {
                // fast path 1: child component re-render only, parent did not
				// change
                return slots._normalized
            } else if (
                isStable &&
                prevSlots &&
                prevSlots !== emptyObject &&
                key === prevSlots.$key &&
                !hasNormalSlots &&
                !prevSlots.$hasNormal) {
                // fast path 2: stable scoped slots w/ no normal slots to proxy,
                // only need to normalize once
                return prevSlots
            } else {
                res = {};
                for (var key$1 in slots) {
                    if (slots[key$1] && key$1[0] !== '$') {
                        res[key$1] = normalizeScopedSlot(normalSlots, key$1, slots[key$1]);
                    }
                }
            }
            // expose normal slots on scopedSlots
            for (var key$2 in normalSlots) {
                if (!(key$2 in res)) {
                    res[key$2] = proxyNormalSlot(normalSlots, key$2);
                }
            }
            // avoriaz seems to mock a non-extensible $scopedSlots object
            // and when that is passed down this would cause an error
            if (slots && Object.isExtensible(slots)) {
                (slots)._normalized = res;
            }
            def(res, '$stable', isStable);
            def(res, '$key', key);
            def(res, '$hasNormal', hasNormalSlots);
            return res
        }

        function normalizeScopedSlot(normalSlots, key, fn) {
            var normalized = function () {
                var res = arguments.length ? fn.apply(null, arguments) : fn({});
                res = res && typeof res === 'object' && !Array.isArray(res)
                     ? [res]// single vnode
                     : normalizeChildren(res);
                return res && (
                    res.length === 0 ||
                    (res.length === 1 && res[0].isComment) // #9658
                ) ? undefined
                 : res
            };
            // this is a slot using the new v-slot syntax without scope.
			// although it is
            // compiled as a scoped slot, render fn users would expect it to be
			// present
            // on this.$slots because the usage is semantically a normal slot.
            if (fn.proxy) {
                Object.defineProperty(normalSlots, key, {
                    get: normalized,
                    enumerable: true,
                    configurable: true
                });
            }
            return normalized
        }

        function proxyNormalSlot(slots, key) {
            return function () {
                return slots[key];
            }
        }

        /*  */

        /**
		 * Runtime helper for rendering v-for lists.
		 */
        function renderList(
            val,
            render) {
            var ret,
            i,
            l,
            keys,
            key;
            if (Array.isArray(val) || typeof val === 'string') {
                ret = new Array(val.length);
                for (i = 0, l = val.length; i < l; i++) {
                    ret[i] = render(val[i], i);
                }
            } else if (typeof val === 'number') {
                ret = new Array(val);
                for (i = 0; i < val; i++) {
                    ret[i] = render(i + 1, i);
                }
            } else if (isObject(val)) {
                if (hasSymbol && val[Symbol.iterator]) {
                    ret = [];
                    var iterator = val[Symbol.iterator]();
                    var result = iterator.next();
                    while (!result.done) {
                        ret.push(render(result.value, ret.length));
                        result = iterator.next();
                    }
                } else {
                    keys = Object.keys(val);
                    ret = new Array(keys.length);
                    for (i = 0, l = keys.length; i < l; i++) {
                        key = keys[i];
                        ret[i] = render(val[key], key, i);
                    }
                }
            }
            if (!isDef(ret)) {
                ret = [];
            }
            (ret)._isVList = true;
            return ret
        }

        /*  */

        /**
		 * Runtime helper for rendering <slot>
		 */
        function renderSlot(
            name,
            fallback,
            props,
            bindObject) {
            var scopedSlotFn = this.$scopedSlots[name];
            var nodes;
            if (scopedSlotFn) { // scoped slot
                props = props || {};
                if (bindObject) {
                    if (!isObject(bindObject)) {
                        warn(
                            'slot v-bind without argument expects an Object',
                            this);
                    }
                    props = extend(extend({}, bindObject), props);
                }
                nodes = scopedSlotFn(props) || fallback;
            } else {
                nodes = this.$slots[name] || fallback;
            }

            var target = props && props.slot;
            if (target) {
                return this.$createElement('template', {
                    slot: target
                }, nodes)
            } else {
                return nodes
            }
        }

        /*  */

        /**
		 * Runtime helper for resolving filters
		 */
        function resolveFilter(id) {
            return resolveAsset(this.$options, 'filters', id, true) || identity
        }

        /*  */

        function isKeyNotMatch(expect, actual) {
            if (Array.isArray(expect)) {
                return expect.indexOf(actual) === -1
            } else {
                return expect !== actual
            }
        }

        /**
		 * Runtime helper for checking keyCodes from config. exposed as
		 * Vue.prototype._k passing in eventKeyName as last argument separately
		 * for backwards compat
		 */
        function checkKeyCodes(
            eventKeyCode,
            key,
            builtInKeyCode,
            eventKeyName,
            builtInKeyName) {
            var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
            if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
                return isKeyNotMatch(builtInKeyName, eventKeyName)
            } else if (mappedKeyCode) {
                return isKeyNotMatch(mappedKeyCode, eventKeyCode)
            } else if (eventKeyName) {
                return hyphenate(eventKeyName) !== key
            }
        }

        /*  */

        /**
		 * Runtime helper for merging v-bind="object" into a VNode's data.
		 */
        function bindObjectProps(
            data,
            tag,
            value,
            asProp,
            isSync) {
            if (value) {
                if (!isObject(value)) {
                    warn(
                        'v-bind without argument expects an Object or Array value',
                        this);
                } else {
                    if (Array.isArray(value)) {
                        value = toObject(value);
                    }
                    var hash;
                    var loop = function (key) {
                        if (
                            key === 'class' ||
                            key === 'style' ||
                            isReservedAttribute(key)) {
                            hash = data;
                        } else {
                            var type = data.attrs && data.attrs.type;
                            hash = asProp || config.mustUseProp(tag, type, key)
                                 ? data.domProps || (data.domProps = {})
                                 : data.attrs || (data.attrs = {});
                        }
                        var camelizedKey = camelize(key);
                        var hyphenatedKey = hyphenate(key);
                        if (!(camelizedKey in hash) && !(hyphenatedKey in hash)) {
                            hash[key] = value[key];

                            if (isSync) {
                                var on = data.on || (data.on = {});
                                on[("update:" + key)] = function ($event) {
                                    value[key] = $event;
                                };
                            }
                        }
                    };

                    for (var key in value)
                        loop(key);
                }
            }
            return data
        }

        /*  */

        /**
		 * Runtime helper for rendering static trees.
		 */
        function renderStatic(
            index,
            isInFor) {
            var cached = this._staticTrees || (this._staticTrees = []);
            var tree = cached[index];
            // if has already-rendered static tree and not inside v-for,
            // we can reuse the same tree.
            if (tree && !isInFor) {
                return tree
            }
            // otherwise, render a fresh tree.
            tree = cached[index] = this.$options.staticRenderFns[index].call(
                    this._renderProxy,
                    null,
                    this // for render fns generated for functional component
							// templates
                );
            markStatic(tree, ("__static__" + index), false);
            return tree
        }

        /**
		 * Runtime helper for v-once. Effectively it means marking the node as
		 * static with a unique key.
		 */
        function markOnce(
            tree,
            index,
            key) {
            markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
            return tree
        }

        function markStatic(
            tree,
            key,
            isOnce) {
            if (Array.isArray(tree)) {
                for (var i = 0; i < tree.length; i++) {
                    if (tree[i] && typeof tree[i] !== 'string') {
                        markStaticNode(tree[i], (key + "_" + i), isOnce);
                    }
                }
            } else {
                markStaticNode(tree, key, isOnce);
            }
        }

        function markStaticNode(node, key, isOnce) {
            node.isStatic = true;
            node.key = key;
            node.isOnce = isOnce;
        }

        /*  */

        function bindObjectListeners(data, value) {
            if (value) {
                if (!isPlainObject(value)) {
                    warn(
                        'v-on without argument expects an Object value',
                        this);
                } else {
                    var on = data.on = data.on ? extend({}, data.on) : {};
                    for (var key in value) {
                        var existing = on[key];
                        var ours = value[key];
                        on[key] = existing ? [].concat(existing, ours) : ours;
                    }
                }
            }
            return data
        }

        /*  */

        function resolveScopedSlots(
            fns, // see flow/vnode
            res,
            // the following are added in 2.6
            hasDynamicKeys,
            contentHashKey) {
            res = res || {
                $stable: !hasDynamicKeys
            };
            for (var i = 0; i < fns.length; i++) {
                var slot = fns[i];
                if (Array.isArray(slot)) {
                    resolveScopedSlots(slot, res, hasDynamicKeys);
                } else if (slot) {
                    // marker for reverse proxying v-slot without scope on
					// this.$slots
                    if (slot.proxy) {
                        slot.fn.proxy = true;
                    }
                    res[slot.key] = slot.fn;
                }
            }
            if (contentHashKey) {
                (res).$key = contentHashKey;
            }
            return res
        }

        /*  */

        function bindDynamicKeys(baseObj, values) {
            for (var i = 0; i < values.length; i += 2) {
                var key = values[i];
                if (typeof key === 'string' && key) {
                    baseObj[values[i]] = values[i + 1];
                } else if (key !== '' && key !== null) {
                    // null is a special value for explicitly removing a binding
                    warn(
                        ("Invalid value for dynamic directive argument (expected string or null): " + key),
                        this);
                }
            }
            return baseObj
        }

        // helper to dynamically append modifier runtime markers to event names.
        // ensure only append when value is already string, otherwise it will be
        // cast
        // to string and cause the type check to miss.
        function prependModifier(value, symbol) {
            return typeof value === 'string' ? symbol + value : value
        }

        /*  */

        function installRenderHelpers(target) {
            target._o = markOnce;
            target._n = toNumber;
            target._s = toString;
            target._l = renderList;
            target._t = renderSlot;
            target._q = looseEqual;
            target._i = looseIndexOf;
            target._m = renderStatic;
            target._f = resolveFilter;
            target._k = checkKeyCodes;
            target._b = bindObjectProps;
            target._v = createTextVNode;
            target._e = createEmptyVNode;
            target._u = resolveScopedSlots;
            target._g = bindObjectListeners;
            target._d = bindDynamicKeys;
            target._p = prependModifier;
        }

        /*  */

        function FunctionalRenderContext(
            data,
            props,
            children,
            parent,
            Ctor) {
            var this$1 = this;

            var options = Ctor.options;
            // ensure the createElement function in functional components
            // gets a unique context - this is necessary for correct named slot
			// check
            var contextVm;
            if (hasOwn(parent, '_uid')) {
                contextVm = Object.create(parent);
                // $flow-disable-line
                contextVm._original = parent;
            } else {
                // the context vm passed in is a functional context as well.
                // in this case we want to make sure we are able to get a hold
				// to the
                // real context instance.
                contextVm = parent;
                // $flow-disable-line
                parent = parent._original;
            }
            var isCompiled = isTrue(options._compiled);
            var needNormalization = !isCompiled;

            this.data = data;
            this.props = props;
            this.children = children;
            this.parent = parent;
            this.listeners = data.on || emptyObject;
            this.injections = resolveInject(options.inject, parent);
            this.slots = function () {
                if (!this$1.$slots) {
                    normalizeScopedSlots(
                        data.scopedSlots,
                        this$1.$slots = resolveSlots(children, parent));
                }
                return this$1.$slots
            };

            Object.defineProperty(this, 'scopedSlots', ({
                    enumerable: true,
                    get: function get() {
                        return normalizeScopedSlots(data.scopedSlots, this.slots())
                    }
                }));

            // support for compiled functional template
            if (isCompiled) {
                // exposing $options for renderStatic()
                this.$options = options;
                // pre-resolve slots for renderSlot()
                this.$slots = this.slots();
                this.$scopedSlots = normalizeScopedSlots(data.scopedSlots, this.$slots);
            }

            if (options._scopeId) {
                this._c = function (a, b, c, d) {
                    var vnode = createElement(contextVm, a, b, c, d, needNormalization);
                    if (vnode && !Array.isArray(vnode)) {
                        vnode.fnScopeId = options._scopeId;
                        vnode.fnContext = parent;
                    }
                    return vnode
                };
            } else {
                this._c = function (a, b, c, d) {
                    return createElement(contextVm, a, b, c, d, needNormalization);
                };
            }
        }

        installRenderHelpers(FunctionalRenderContext.prototype);

        function createFunctionalComponent(
            Ctor,
            propsData,
            data,
            contextVm,
            children) {
            var options = Ctor.options;
            var props = {};
            var propOptions = options.props;
            if (isDef(propOptions)) {
                for (var key in propOptions) {
                    props[key] = validateProp(key, propOptions, propsData || emptyObject);
                }
            } else {
                if (isDef(data.attrs)) {
                    mergeProps(props, data.attrs);
                }
                if (isDef(data.props)) {
                    mergeProps(props, data.props);
                }
            }

            var renderContext = new FunctionalRenderContext(
                    data,
                    props,
                    children,
                    contextVm,
                    Ctor);

            var vnode = options.render.call(null, renderContext._c, renderContext);

            if (vnode instanceof VNode) {
                return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options, renderContext)
            } else if (Array.isArray(vnode)) {
                var vnodes = normalizeChildren(vnode) || [];
                var res = new Array(vnodes.length);
                for (var i = 0; i < vnodes.length; i++) {
                    res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options, renderContext);
                }
                return res
            }
        }

        function cloneAndMarkFunctionalResult(vnode, data, contextVm, options, renderContext) {
            // #7817 clone node before setting fnContext, otherwise if the node
			// is
            // reused
            // (e.g. it was from a cached normal slot) the fnContext causes
			// named slots
            // that should not be matched to match.
            var clone = cloneVNode(vnode);
            clone.fnContext = contextVm;
            clone.fnOptions = options;{
                (clone.devtoolsMeta = clone.devtoolsMeta || {}).renderContext = renderContext;
            }
            if (data.slot) {
                (clone.data || (clone.data = {})).slot = data.slot;
            }
            return clone
        }

        function mergeProps(to, from) {
            for (var key in from) {
                to[camelize(key)] = from[key];
            }
        }

        /*  */

        /*  */

        /*  */

        /*  */

        // inline hooks to be invoked on component VNodes during patch
        var componentVNodeHooks = {
            init: function init(vnode, hydrating) {
                if (
                    vnode.componentInstance &&
                    !vnode.componentInstance._isDestroyed &&
                    vnode.data.keepAlive) {
                    // kept-alive components, treat as a patch
                    var mountedNode = vnode; // work around flow
                    componentVNodeHooks.prepatch(mountedNode, mountedNode);
                } else {
                    var child = vnode.componentInstance = createComponentInstanceForVnode(
                            vnode,
                            activeInstance);
                    child.$mount(hydrating ? vnode.elm : undefined, hydrating);
                }
            },

            prepatch: function prepatch(oldVnode, vnode) {
                var options = vnode.componentOptions;
                var child = vnode.componentInstance = oldVnode.componentInstance;
                updateChildComponent(
                    child,
                    options.propsData, // updated props
                    options.listeners, // updated listeners
                    vnode, // new parent vnode
                    options.children // new children
                );
            },

            insert: function insert(vnode) {
                var context = vnode.context;
                var componentInstance = vnode.componentInstance;
                if (!componentInstance._isMounted) {
                    componentInstance._isMounted = true;
                    callHook(componentInstance, 'mounted');
                }
                if (vnode.data.keepAlive) {
                    if (context._isMounted) {
                        // vue-router#1212
                        // During updates, a kept-alive component's child
						// components may
                        // change, so directly walking the tree here may call
						// activated
                        // hooks
                        // on incorrect children. Instead we push them into a
						// queue which
                        // will
                        // be processed after the whole patch process ended.
                        queueActivatedComponent(componentInstance);
                    } else {
                        activateChildComponent(componentInstance, true /* direct */);
                    }
                }
            },

            destroy: function destroy(vnode) {
                var componentInstance = vnode.componentInstance;
                if (!componentInstance._isDestroyed) {
                    if (!vnode.data.keepAlive) {
                        componentInstance.$destroy();
                    } else {
                        deactivateChildComponent(componentInstance, true /* direct */);
                    }
                }
            }
        };

        var hooksToMerge = Object.keys(componentVNodeHooks);

        function createComponent(
            Ctor,
            data,
            context,
            children,
            tag) {
            if (isUndef(Ctor)) {
                return
            }

            var baseCtor = context.$options._base;

            // plain options object: turn it into a constructor
            if (isObject(Ctor)) {
                Ctor = baseCtor.extend(Ctor);
            }

            // if at this stage it's not a constructor or an async component
			// factory,
            // reject.
            if (typeof Ctor !== 'function') { {
                    warn(("Invalid Component definition: " + (String(Ctor))), context);
                }
                return
            }

            // async component
            var asyncFactory;
            if (isUndef(Ctor.cid)) {
                asyncFactory = Ctor;
                Ctor = resolveAsyncComponent(asyncFactory, baseCtor);
                if (Ctor === undefined) {
                    // return a placeholder node for async component, which is
					// rendered
                    // as a comment node but preserves all the raw information
					// for the node.
                    // the information will be used for async server-rendering
					// and
                    // hydration.
                    return createAsyncPlaceholder(
                        asyncFactory,
                        data,
                        context,
                        children,
                        tag)
                }
            }

            data = data || {};

            // resolve constructor options in case global mixins are applied
			// after
            // component constructor creation
            resolveConstructorOptions(Ctor);

            // transform component v-model data into props & events
            if (isDef(data.model)) {
                transformModel(Ctor.options, data);
            }

            // extract props
            var propsData = extractPropsFromVNodeData(data, Ctor, tag);

            // functional component
            if (isTrue(Ctor.options.functional)) {
                return createFunctionalComponent(Ctor, propsData, data, context, children)
            }

            // extract listeners, since these needs to be treated as
            // child component listeners instead of DOM listeners
            var listeners = data.on;
            // replace with listeners with .native modifier
            // so it gets processed during parent component patch.
            data.on = data.nativeOn;

            if (isTrue(Ctor.options.abstract)) {
                // abstract components do not keep anything
                // other than props & listeners & slot

                // work around flow
                var slot = data.slot;
                data = {};
                if (slot) {
                    data.slot = slot;
                }
            }

            // install component management hooks onto the placeholder node
            installComponentHooks(data);

            // return a placeholder vnode
            var name = Ctor.options.name || tag;
            var vnode = new VNode(
                    ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
                    data, undefined, undefined, undefined, context, {
                    Ctor: Ctor,
                    propsData: propsData,
                    listeners: listeners,
                    tag: tag,
                    children: children
                },
                    asyncFactory);

            return vnode
        }

        function createComponentInstanceForVnode(
            vnode, // we know it's MountedComponentVNode but flow doesn't
            parent // activeInstance in lifecycle state
        ) {
            var options = {
                _isComponent: true,
                _parentVnode: vnode,
                parent: parent
            };
            // check inline-template render functions
            var inlineTemplate = vnode.data.inlineTemplate;
            if (isDef(inlineTemplate)) {
                options.render = inlineTemplate.render;
                options.staticRenderFns = inlineTemplate.staticRenderFns;
            }
            return new vnode.componentOptions.Ctor(options)
        }

        function installComponentHooks(data) {
            var hooks = data.hook || (data.hook = {});
            for (var i = 0; i < hooksToMerge.length; i++) {
                var key = hooksToMerge[i];
                var existing = hooks[key];
                var toMerge = componentVNodeHooks[key];
                if (existing !== toMerge && !(existing && existing._merged)) {
                    hooks[key] = existing ? mergeHook$1(toMerge, existing) : toMerge;
                }
            }
        }

        function mergeHook$1(f1, f2) {
            var merged = function (a, b) {
                // flow complains about extra args which is why we use any
                f1(a, b);
                f2(a, b);
            };
            merged._merged = true;
            return merged
        }

        // transform component v-model info (value and callback) into
        // prop and event handler respectively.
        function transformModel(options, data) {
            var prop = (options.model && options.model.prop) || 'value';
            var event = (options.model && options.model.event) || 'input';
            (data.attrs || (data.attrs = {}))[prop] = data.model.value;
            var on = data.on || (data.on = {});
            var existing = on[event];
            var callback = data.model.callback;
            if (isDef(existing)) {
                if (
                    Array.isArray(existing)
                     ? existing.indexOf(callback) === -1
                     : existing !== callback) {
                    on[event] = [callback].concat(existing);
                }
            } else {
                on[event] = callback;
            }
        }

        /*  */

        var SIMPLE_NORMALIZE = 1;
        var ALWAYS_NORMALIZE = 2;

        // wrapper function for providing a more flexible interface
        // without getting yelled at by flow
        function createElement(
            context,
            tag,
            data,
            children,
            normalizationType,
            alwaysNormalize) {
            if (Array.isArray(data) || isPrimitive(data)) {
                normalizationType = children;
                children = data;
                data = undefined;
            }
            if (isTrue(alwaysNormalize)) {
                normalizationType = ALWAYS_NORMALIZE;
            }
            return _createElement(context, tag, data, children, normalizationType)
        }

        function _createElement(
            context,
            tag,
            data,
            children,
            normalizationType) {
            if (isDef(data) && isDef((data).__ob__)) {
                warn(
                    "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
                    'Always create fresh vnode data objects in each render!',
                    context);
                return createEmptyVNode()
            }
            // object syntax in v-bind
            if (isDef(data) && isDef(data.is)) {
                tag = data.is;
            }
            if (!tag) {
                // in case of component :is set to falsy value
                return createEmptyVNode()
            }
            // warn against non-primitive key
            if (isDef(data) && isDef(data.key) && !isPrimitive(data.key)) { {
                    warn(
                        'Avoid using non-primitive value as key, ' +
                        'use string/number value instead.',
                        context);
                }
            }
            // support single function children as default scoped slot
            if (Array.isArray(children) &&
                typeof children[0] === 'function') {
                data = data || {};
                data.scopedSlots = {
                default:
                    children[0]
                };
                children.length = 0;
            }
            if (normalizationType === ALWAYS_NORMALIZE) {
                children = normalizeChildren(children);
            } else if (normalizationType === SIMPLE_NORMALIZE) {
                children = simpleNormalizeChildren(children);
            }
            var vnode,
            ns;
            if (typeof tag === 'string') {
                var Ctor;
                ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
                if (config.isReservedTag(tag)) {
                    // platform built-in elements
                    if (isDef(data) && isDef(data.nativeOn)) {
                        warn(
                            ("The .native modifier for v-on is only valid on components but it was used on <" + tag + ">."),
                            context);
                    }
                    vnode = new VNode(
                            config.parsePlatformTagName(tag), data, children,
                            undefined, undefined, context);
                } else if ((!data || !data.pre) && isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
                    // component
                    vnode = createComponent(Ctor, data, context, children, tag);
                } else {
                    // unknown or unlisted namespaced elements
                    // check at runtime because it may get assigned a namespace
					// when its
                    // parent normalizes children
                    vnode = new VNode(
                            tag, data, children,
                            undefined, undefined, context);
                }
            } else {
                // direct component options / constructor
                vnode = createComponent(tag, data, context, children);
            }
            if (Array.isArray(vnode)) {
                return vnode
            } else if (isDef(vnode)) {
                if (isDef(ns)) {
                    applyNS(vnode, ns);
                }
                if (isDef(data)) {
                    registerDeepBindings(data);
                }
                return vnode
            } else {
                return createEmptyVNode()
            }
        }

        function applyNS(vnode, ns, force) {
            vnode.ns = ns;
            if (vnode.tag === 'foreignObject') {
                // use default namespace inside foreignObject
                ns = undefined;
                force = true;
            }
            if (isDef(vnode.children)) {
                for (var i = 0, l = vnode.children.length; i < l; i++) {
                    var child = vnode.children[i];
                    if (isDef(child.tag) && (
                            isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
                        applyNS(child, ns, force);
                    }
                }
            }
        }

        // ref #5318
        // necessary to ensure parent re-render when deep bindings like :style
		// and
        // :class are used on slot nodes
        function registerDeepBindings(data) {
            if (isObject(data.style)) {
                traverse(data.style);
            }
            if (isObject(data.class)) {
                traverse(data.class);
            }
        }

        /*  */

        function initRender(vm) {
            vm._vnode = null; // the root of the child tree
            vm._staticTrees = null; // v-once cached trees
            var options = vm.$options;
            var parentVnode = vm.$vnode = options._parentVnode; // the
																// placeholder
																// node
            // in parent tree
            var renderContext = parentVnode && parentVnode.context;
            vm.$slots = resolveSlots(options._renderChildren, renderContext);
            vm.$scopedSlots = emptyObject;
            // bind the createElement fn to this instance
            // so that we get proper render context inside it.
            // args order: tag, data, children, normalizationType,
			// alwaysNormalize
            // internal version is used by render functions compiled from
			// templates
            vm._c = function (a, b, c, d) {
                return createElement(vm, a, b, c, d, false);
            };
            // normalization is always applied for the public version, used in
            // user-written render functions.
            vm.$createElement = function (a, b, c, d) {
                return createElement(vm, a, b, c, d, true);
            };

            // $attrs & $listeners are exposed for easier HOC creation.
            // they need to be reactive so that HOCs using them are always
			// updated
            var parentData = parentVnode && parentVnode.data;

            /* istanbul ignore else */
            {
                defineReactive$$1(vm, '$attrs', parentData && parentData.attrs || emptyObject, function () {
                    !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
                }, true);
                defineReactive$$1(vm, '$listeners', options._parentListeners || emptyObject, function () {
                    !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
                }, true);
            }
        }

        var currentRenderingInstance = null;

        function renderMixin(Vue) {
            // install runtime convenience helpers
            installRenderHelpers(Vue.prototype);

            Vue.prototype.$nextTick = function (fn) {
                return nextTick(fn, this)
            };

            Vue.prototype._render = function () {
                var vm = this;
                var ref = vm.$options;
                var render = ref.render;
                var _parentVnode = ref._parentVnode;

                if (_parentVnode) {
                    vm.$scopedSlots = normalizeScopedSlots(
                            _parentVnode.data.scopedSlots,
                            vm.$slots,
                            vm.$scopedSlots);
                }

                // set parent vnode. this allows render functions to have access
                // to the data on the placeholder node.
                vm.$vnode = _parentVnode;
                // render self
                var vnode;
                try {
                    // There's no need to maintain a stack because all render
					// fns are called
                    // separately from one another. Nested component's render
					// fns are called
                    // when parent component is patched.
                    currentRenderingInstance = vm;
                    vnode = render.call(vm._renderProxy, vm.$createElement);
                } catch (e) {
                    handleError(e, vm, "render");
                    // return error render result,
                    // or previous vnode to prevent render error causing blank
					// component
                    /* istanbul ignore else */
                    if (vm.$options.renderError) {
                        try {
                            vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
                        } catch (e) {
                            handleError(e, vm, "renderError");
                            vnode = vm._vnode;
                        }
                    } else {
                        vnode = vm._vnode;
                    }
                }
                finally {
                    currentRenderingInstance = null;
                }
                // if the returned array contains only a single node, allow it
                if (Array.isArray(vnode) && vnode.length === 1) {
                    vnode = vnode[0];
                }
                // return empty vnode in case the render function errored out
                if (!(vnode instanceof VNode)) {
                    if (Array.isArray(vnode)) {
                        warn(
                            'Multiple root nodes returned from render function. Render function ' +
                            'should return a single root node.',
                            vm);
                    }
                    vnode = createEmptyVNode();
                }
                // set parent
                vnode.parent = _parentVnode;
                return vnode
            };
        }

        /*  */

        function ensureCtor(comp, base) {
            if (
                comp.__esModule ||
                (hasSymbol && comp[Symbol.toStringTag] === 'Module')) {
                comp = comp.default;
            }
            return isObject(comp)
             ? base.extend(comp)
             : comp
        }

        function createAsyncPlaceholder(
            factory,
            data,
            context,
            children,
            tag) {
            var node = createEmptyVNode();
            node.asyncFactory = factory;
            node.asyncMeta = {
                data: data,
                context: context,
                children: children,
                tag: tag
            };
            return node
        }

        function resolveAsyncComponent(
            factory,
            baseCtor) {
            if (isTrue(factory.error) && isDef(factory.errorComp)) {
                return factory.errorComp
            }

            if (isDef(factory.resolved)) {
                return factory.resolved
            }

            var owner = currentRenderingInstance;
            if (owner && isDef(factory.owners) && factory.owners.indexOf(owner) === -1) {
                // already pending
                factory.owners.push(owner);
            }

            if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
                return factory.loadingComp
            }

            if (owner && !isDef(factory.owners)) {
                var owners = factory.owners = [owner];
                var sync = true;
                var timerLoading = null;
                var timerTimeout = null;
                (owner).$on('hook:destroyed', function () {
                    return remove(owners, owner);
                });

                var forceRender = function (renderCompleted) {
                    for (var i = 0, l = owners.length; i < l; i++) {
                        (owners[i]).$forceUpdate();
                    }

                    if (renderCompleted) {
                        owners.length = 0;
                        if (timerLoading !== null) {
                            clearTimeout(timerLoading);
                            timerLoading = null;
                        }
                        if (timerTimeout !== null) {
                            clearTimeout(timerTimeout);
                            timerTimeout = null;
                        }
                    }
                };

                var resolve = once(function (res) {
                        // cache resolved
                        factory.resolved = ensureCtor(res, baseCtor);
                        // invoke callbacks only if this is not a synchronous
						// resolve
                        // (async resolves are shimmed as synchronous during
						// SSR)
                        if (!sync) {
                            forceRender(true);
                        } else {
                            owners.length = 0;
                        }
                    });

                var reject = once(function (reason) {
                        warn(
                            "Failed to resolve async component: " + (String(factory)) +
                            (reason ? ("\nReason: " + reason) : ''));
                        if (isDef(factory.errorComp)) {
                            factory.error = true;
                            forceRender(true);
                        }
                    });

                var res = factory(resolve, reject);

                if (isObject(res)) {
                    if (isPromise(res)) {
                        // () => Promise
                        if (isUndef(factory.resolved)) {
                            res.then(resolve, reject);
                        }
                    } else if (isPromise(res.component)) {
                        res.component.then(resolve, reject);

                        if (isDef(res.error)) {
                            factory.errorComp = ensureCtor(res.error, baseCtor);
                        }

                        if (isDef(res.loading)) {
                            factory.loadingComp = ensureCtor(res.loading, baseCtor);
                            if (res.delay === 0) {
                                factory.loading = true;
                            } else {
                                timerLoading = setTimeout(function () {
                                        timerLoading = null;
                                        if (isUndef(factory.resolved) && isUndef(factory.error)) {
                                            factory.loading = true;
                                            forceRender(false);
                                        }
                                    }, res.delay || 200);
                            }
                        }

                        if (isDef(res.timeout)) {
                            timerTimeout = setTimeout(function () {
                                    timerTimeout = null;
                                    if (isUndef(factory.resolved)) {
                                        reject(
                                            "timeout (" + (res.timeout) + "ms)");
                                    }
                                }, res.timeout);
                        }
                    }
                }

                sync = false;
                // return in case resolved synchronously
                return factory.loading
                 ? factory.loadingComp
                 : factory.resolved
            }
        }

        /*  */

        function isAsyncPlaceholder(node) {
            return node.isComment && node.asyncFactory
        }

        /*  */

        function getFirstComponentChild(children) {
            if (Array.isArray(children)) {
                for (var i = 0; i < children.length; i++) {
                    var c = children[i];
                    if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
                        return c
                    }
                }
            }
        }

        /*  */

        /*  */

        function initEvents(vm) {
            vm._events = Object.create(null);
            vm._hasHookEvent = false;
            // init parent attached events
            var listeners = vm.$options._parentListeners;
            if (listeners) {
                updateComponentListeners(vm, listeners);
            }
        }

        var target;

        function add(event, fn) {
            target.$on(event, fn);
        }

        function remove$1(event, fn) {
            target.$off(event, fn);
        }

        function createOnceHandler(event, fn) {
            var _target = target;
            return function onceHandler() {
                var res = fn.apply(null, arguments);
                if (res !== null) {
                    _target.$off(event, onceHandler);
                }
            }
        }

        function updateComponentListeners(
            vm,
            listeners,
            oldListeners) {
            target = vm;
            updateListeners(listeners, oldListeners || {}, add, remove$1, createOnceHandler, vm);
            target = undefined;
        }

        function eventsMixin(Vue) {
            var hookRE = /^hook:/;
            Vue.prototype.$on = function (event, fn) {
                var vm = this;
                if (Array.isArray(event)) {
                    for (var i = 0, l = event.length; i < l; i++) {
                        vm.$on(event[i], fn);
                    }
                } else {
                    (vm._events[event] || (vm._events[event] = [])).push(fn);
                    // optimize hook:event cost by using a boolean flag marked
					// at
                    // registration
                    // instead of a hash lookup
                    if (hookRE.test(event)) {
                        vm._hasHookEvent = true;
                    }
                }
                return vm
            };

            Vue.prototype.$once = function (event, fn) {
                var vm = this;
                function on() {
                    vm.$off(event, on);
                    fn.apply(vm, arguments);
                }
                on.fn = fn;
                vm.$on(event, on);
                return vm
            };

            Vue.prototype.$off = function (event, fn) {
                var vm = this;
                // all
                if (!arguments.length) {
                    vm._events = Object.create(null);
                    return vm
                }
                // array of events
                if (Array.isArray(event)) {
                    for (var i$1 = 0, l = event.length; i$1 < l; i$1++) {
                        vm.$off(event[i$1], fn);
                    }
                    return vm
                }
                // specific event
                var cbs = vm._events[event];
                if (!cbs) {
                    return vm
                }
                if (!fn) {
                    vm._events[event] = null;
                    return vm
                }
                // specific handler
                var cb;
                var i = cbs.length;
                while (i--) {
                    cb = cbs[i];
                    if (cb === fn || cb.fn === fn) {
                        cbs.splice(i, 1);
                        break
                    }
                }
                return vm
            };

            Vue.prototype.$emit = function (event) {
                var vm = this;{
                    var lowerCaseEvent = event.toLowerCase();
                    if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                        tip(
                            "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                            (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                            "Note that HTML attributes are case-insensitive and you cannot use " +
                            "v-on to listen to camelCase events when using in-DOM templates. " +
                            "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\".");
                    }
                }
                var cbs = vm._events[event];
                if (cbs) {
                    cbs = cbs.length > 1 ? toArray(cbs) : cbs;
                    var args = toArray(arguments, 1);
                    var info = "event handler for \"" + event + "\"";
                    for (var i = 0, l = cbs.length; i < l; i++) {
                        invokeWithErrorHandling(cbs[i], vm, args, vm, info);
                    }
                }
                return vm
            };
        }

        /*  */

        var activeInstance = null;
        var isUpdatingChildComponent = false;

        function setActiveInstance(vm) {
            var prevActiveInstance = activeInstance;
            activeInstance = vm;
            return function () {
                activeInstance = prevActiveInstance;
            }
        }

        function initLifecycle(vm) {
            var options = vm.$options;

            // locate first non-abstract parent
            var parent = options.parent;
            if (parent && !options.abstract) {
                while (parent.$options.abstract && parent.$parent) {
                    parent = parent.$parent;
                }
                parent.$children.push(vm);
            }

            vm.$parent = parent;
            vm.$root = parent ? parent.$root : vm;

            vm.$children = [];
            vm.$refs = {};

            vm._watcher = null;
            vm._inactive = null;
            vm._directInactive = false;
            vm._isMounted = false;
            vm._isDestroyed = false;
            vm._isBeingDestroyed = false;
        }

        function lifecycleMixin(Vue) {
            Vue.prototype._update = function (vnode, hydrating) {
                var vm = this;
                var prevEl = vm.$el;
                var prevVnode = vm._vnode;
                var restoreActiveInstance = setActiveInstance(vm);
                vm._vnode = vnode;
                // Vue.prototype.__patch__ is injected in entry points
                // based on the rendering backend used.
                if (!prevVnode) {
                    // initial render
                    vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */);
                } else {
                    // updates
                    vm.$el = vm.__patch__(prevVnode, vnode);
                }
                restoreActiveInstance();
                // update __vue__ reference
                if (prevEl) {
                    prevEl.__vue__ = null;
                }
                if (vm.$el) {
                    vm.$el.__vue__ = vm;
                }
                // if parent is an HOC, update its $el as well
                if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
                    vm.$parent.$el = vm.$el;
                }
                // updated hook is called by the scheduler to ensure that
				// children are
                // updated in a parent's updated hook.
            };

            Vue.prototype.$forceUpdate = function () {
                var vm = this;
                if (vm._watcher) {
                    vm._watcher.update();
                }
            };

            Vue.prototype.$destroy = function () {
                var vm = this;
                if (vm._isBeingDestroyed) {
                    return
                }
                callHook(vm, 'beforeDestroy');
                vm._isBeingDestroyed = true;
                // remove self from parent
                var parent = vm.$parent;
                if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
                    remove(parent.$children, vm);
                }
                // teardown watchers
                if (vm._watcher) {
                    vm._watcher.teardown();
                }
                var i = vm._watchers.length;
                while (i--) {
                    vm._watchers[i].teardown();
                }
                // remove reference from data ob
                // frozen object may not have observer.
                if (vm._data.__ob__) {
                    vm._data.__ob__.vmCount--;
                }
                // call the last hook...
                vm._isDestroyed = true;
                // invoke destroy hooks on current rendered tree
                vm.__patch__(vm._vnode, null);
                // fire destroyed hook
                callHook(vm, 'destroyed');
                // turn off all instance listeners.
                vm.$off();
                // remove __vue__ reference
                if (vm.$el) {
                    vm.$el.__vue__ = null;
                }
                // release circular reference (#6759)
                if (vm.$vnode) {
                    vm.$vnode.parent = null;
                }
            };
        }

        function mountComponent(
            vm,
            el,
            hydrating) {
            vm.$el = el;
            if (!vm.$options.render) {
                vm.$options.render = createEmptyVNode;{
                    /* istanbul ignore if */
                    if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                        vm.$options.el || el) {
                        warn(
                            'You are using the runtime-only build of Vue where the template ' +
                            'compiler is not available. Either pre-compile the templates into ' +
                            'render functions, or use the compiler-included build.',
                            vm);
                    } else {
                        warn(
                            'Failed to mount component: template or render function not defined.',
                            vm);
                    }
                }
            }
            callHook(vm, 'beforeMount');

            var updateComponent;
            /* istanbul ignore if */
            if (config.performance && mark) {
                updateComponent = function () {
                    var name = vm._name;
                    var id = vm._uid;
                    var startTag = "vue-perf-start:" + id;
                    var endTag = "vue-perf-end:" + id;

                    mark(startTag);
                    var vnode = vm._render();
                    mark(endTag);
                    measure(("vue " + name + " render"), startTag, endTag);

                    mark(startTag);
                    vm._update(vnode, hydrating);
                    mark(endTag);
                    measure(("vue " + name + " patch"), startTag, endTag);
                };
            } else {
                updateComponent = function () {
                    vm._update(vm._render(), hydrating);
                };
            }

            // we set this to vm._watcher inside the watcher's constructor
            // since the watcher's initial patch may call $forceUpdate (e.g.
			// inside
            // child
            // component's mounted hook), which relies on vm._watcher being
			// already
            // defined
            new Watcher(vm, updateComponent, noop, {
                before: function before() {
                    if (vm._isMounted && !vm._isDestroyed) {
                        callHook(vm, 'beforeUpdate');
                    }
                }
            }, true /* isRenderWatcher */);
            hydrating = false;

            // manually mounted instance, call mounted on self
            // mounted is called for render-created child components in its
			// inserted
            // hook
            if (vm.$vnode == null) {
                vm._isMounted = true;
                callHook(vm, 'mounted');
            }
            return vm
        }

        function updateChildComponent(
            vm,
            propsData,
            listeners,
            parentVnode,
            renderChildren) { {
                isUpdatingChildComponent = true;
            }

            // determine whether component has slot children
            // we need to do this before overwriting $options._renderChildren.

            // check if there are dynamic scopedSlots (hand-written or compiled
			// but with
            // dynamic slot names). Static scoped slots compiled from template
			// has the
            // "$stable" marker.
            var newScopedSlots = parentVnode.data.scopedSlots;
            var oldScopedSlots = vm.$scopedSlots;
            var hasDynamicScopedSlot = !!(
                (newScopedSlots && !newScopedSlots.$stable) ||
                (oldScopedSlots !== emptyObject && !oldScopedSlots.$stable) ||
                (newScopedSlots && vm.$scopedSlots.$key !== newScopedSlots.$key));

            // Any static slot children from the parent may have changed during
			// parent's
            // update. Dynamic scoped slots may also have changed. In such
			// cases, a
            // forced
            // update is necessary to ensure correctness.
            var needsForceUpdate = !!(
                renderChildren || // has new static slots
                vm.$options._renderChildren || // has old static slots
                hasDynamicScopedSlot);

            vm.$options._parentVnode = parentVnode;
            vm.$vnode = parentVnode; // update vm's placeholder node without
            // re-render

            if (vm._vnode) { // update child tree's parent
                vm._vnode.parent = parentVnode;
            }
            vm.$options._renderChildren = renderChildren;

            // update $attrs and $listeners hash
            // these are also reactive so they may trigger child update if the
			// child
            // used them during render
            vm.$attrs = parentVnode.data.attrs || emptyObject;
            vm.$listeners = listeners || emptyObject;

            // update props
            if (propsData && vm.$options.props) {
                toggleObserving(false);
                var props = vm._props;
                var propKeys = vm.$options._propKeys || [];
                for (var i = 0; i < propKeys.length; i++) {
                    var key = propKeys[i];
                    var propOptions = vm.$options.props; // wtf flow?
                    props[key] = validateProp(key, propOptions, propsData, vm);
                }
                toggleObserving(true);
                // keep a copy of raw propsData
                vm.$options.propsData = propsData;
            }

            // update listeners
            listeners = listeners || emptyObject;
            var oldListeners = vm.$options._parentListeners;
            vm.$options._parentListeners = listeners;
            updateComponentListeners(vm, listeners, oldListeners);

            // resolve slots + force update if has children
            if (needsForceUpdate) {
                vm.$slots = resolveSlots(renderChildren, parentVnode.context);
                vm.$forceUpdate();
            }
            {
                isUpdatingChildComponent = false;
            }
        }

        function isInInactiveTree(vm) {
            while (vm && (vm = vm.$parent)) {
                if (vm._inactive) {
                    return true
                }
            }
            return false
        }

        function activateChildComponent(vm, direct) {
            if (direct) {
                vm._directInactive = false;
                if (isInInactiveTree(vm)) {
                    return
                }
            } else if (vm._directInactive) {
                return
            }
            if (vm._inactive || vm._inactive === null) {
                vm._inactive = false;
                for (var i = 0; i < vm.$children.length; i++) {
                    activateChildComponent(vm.$children[i]);
                }
                callHook(vm, 'activated');
            }
        }

        function deactivateChildComponent(vm, direct) {
            if (direct) {
                vm._directInactive = true;
                if (isInInactiveTree(vm)) {
                    return
                }
            }
            if (!vm._inactive) {
                vm._inactive = true;
                for (var i = 0; i < vm.$children.length; i++) {
                    deactivateChildComponent(vm.$children[i]);
                }
                callHook(vm, 'deactivated');
            }
        }

        function callHook(vm, hook) {
            // #7573 disable dep collection when invoking lifecycle hooks
            pushTarget();
            var handlers = vm.$options[hook];
            var info = hook + " hook";
            if (handlers) {
                for (var i = 0, j = handlers.length; i < j; i++) {
                    invokeWithErrorHandling(handlers[i], vm, null, vm, info);
                }
            }
            if (vm._hasHookEvent) {
                vm.$emit('hook:' + hook);
            }
            popTarget();
        }

        /*  */

        var MAX_UPDATE_COUNT = 100;

        var queue = [];
        var activatedChildren = [];
        var has = {};
        var circular = {};
        var waiting = false;
        var flushing = false;
        var index = 0;

        /**
		 * Reset the scheduler's state.
		 */
        function resetSchedulerState() {
            index = queue.length = activatedChildren.length = 0;
            has = {};{
                circular = {};
            }
            waiting = flushing = false;
        }

        // Async edge case #6566 requires saving the timestamp when event
		// listeners
        // are
        // attached. However, calling performance.now() has a perf overhead
        // especially
        // if the page has thousands of event listeners. Instead, we take a
        // timestamp
        // every time the scheduler flushes and use that for all event listeners
        // attached during that flush.
        var currentFlushTimestamp = 0;

        // Async edge case fix requires storing an event listener's attach
        // timestamp.
        var getNow = Date.now;

        // Determine what event timestamp the browser is using. Annoyingly, the
        // timestamp can either be hi-res (relative to page load) or low-res
        // (relative to UNIX epoch), so in order to compare time we have to use
		// the
        // same timestamp type when saving the flush timestamp.
        // All IE versions use low-res event timestamps, and have problematic
		// clock
        // implementations (#9632)
        if (inBrowser && !isIE) {
            var performance = window.performance;
            if (
                performance &&
                typeof performance.now === 'function' &&
                getNow() > document.createEvent('Event').timeStamp) {
                // if the event timestamp, although evaluated AFTER the
				// Date.now(), is
                // smaller than it, it means the event is using a hi-res
				// timestamp,
                // and we need to use the hi-res version for event listener
				// timestamps
                // as
                // well.
                getNow = function () {
                    return performance.now();
                };
            }
        }

        /**
		 * Flush both queues and run the watchers.
		 */
        function flushSchedulerQueue() {
            currentFlushTimestamp = getNow();
            flushing = true;
            var watcher,
            id;

            // Sort queue before flush.
            // This ensures that:
            // 1. Components are updated from parent to child. (because parent
			// is always
            // created before the child)
            // 2. A component's user watchers are run before its render watcher
			// (because
            // user watchers are created before the render watcher)
            // 3. If a component is destroyed during a parent component's
			// watcher run,
            // its watchers can be skipped.
            queue.sort(function (a, b) {
                return a.id - b.id;
            });

            // do not cache length because more watchers might be pushed
            // as we run existing watchers
            for (index = 0; index < queue.length; index++) {
                watcher = queue[index];
                if (watcher.before) {
                    watcher.before();
                }
                id = watcher.id;
                has[id] = null;
                watcher.run();
                // in dev build, check and stop circular updates.
                if (has[id] != null) {
                    circular[id] = (circular[id] || 0) + 1;
                    if (circular[id] > MAX_UPDATE_COUNT) {
                        warn(
                            'You may have an infinite update loop ' + (
                                watcher.user
                                 ? ("in watcher with expression \"" + (watcher.expression) + "\"")
                                 : "in a component render function."),
                            watcher.vm);
                        break
                    }
                }
            }

            // keep copies of post queues before resetting state
            var activatedQueue = activatedChildren.slice();
            var updatedQueue = queue.slice();

            resetSchedulerState();

            // call component updated and activated hooks
            callActivatedHooks(activatedQueue);
            callUpdatedHooks(updatedQueue);

            // devtool hook
            /* istanbul ignore if */
            if (devtools && config.devtools) {
                devtools.emit('flush');
            }
        }

        function callUpdatedHooks(queue) {
            var i = queue.length;
            while (i--) {
                var watcher = queue[i];
                var vm = watcher.vm;
                if (vm._watcher === watcher && vm._isMounted && !vm._isDestroyed) {
                    callHook(vm, 'updated');
                }
            }
        }

        /**
		 * Queue a kept-alive component that was activated during patch. The
		 * queue will be processed after the entire tree has been patched.
		 */
        function queueActivatedComponent(vm) {
            // setting _inactive to false here so that a render function can
            // rely on checking whether it's in an inactive tree (e.g.
			// router-view)
            vm._inactive = false;
            activatedChildren.push(vm);
        }

        function callActivatedHooks(queue) {
            for (var i = 0; i < queue.length; i++) {
                queue[i]._inactive = true;
                activateChildComponent(queue[i], true /* true */);
            }
        }

        /**
		 * Push a watcher into the watcher queue. Jobs with duplicate IDs will
		 * be skipped unless it's pushed when the queue is being flushed.
		 */
        function queueWatcher(watcher) {
            var id = watcher.id;
            if (has[id] == null) {
                has[id] = true;
                if (!flushing) {
                    queue.push(watcher);
                } else {
                    // if already flushing, splice the watcher based on its id
                    // if already past its id, it will be run next immediately.
                    var i = queue.length - 1;
                    while (i > index && queue[i].id > watcher.id) {
                        i--;
                    }
                    queue.splice(i + 1, 0, watcher);
                }
                // queue the flush
                if (!waiting) {
                    waiting = true;

                    if (!config.async) {
                        flushSchedulerQueue();
                        return
                    }
                    nextTick(flushSchedulerQueue);
                }
            }
        }

        /*  */

        var uid$2 = 0;

        /**
		 * A watcher parses an expression, collects dependencies, and fires
		 * callback when the expression value changes. This is used for both the
		 * $watch() api and directives.
		 */
        var Watcher = function Watcher(
            vm,
            expOrFn,
            cb,
            options,
            isRenderWatcher) {
            this.vm = vm;
            if (isRenderWatcher) {
                vm._watcher = this;
            }
            vm._watchers.push(this);
            // options
            if (options) {
                this.deep = !!options.deep;
                this.user = !!options.user;
                this.lazy = !!options.lazy;
                this.sync = !!options.sync;
                this.before = options.before;
            } else {
                this.deep = this.user = this.lazy = this.sync = false;
            }
            this.cb = cb;
            this.id = ++uid$2; // uid for batching
            this.active = true;
            this.dirty = this.lazy; // for lazy watchers
            this.deps = [];
            this.newDeps = [];
            this.depIds = new _Set();
            this.newDepIds = new _Set();
            this.expression = expOrFn.toString();
            // parse expression for getter
            if (typeof expOrFn === 'function') {
                this.getter = expOrFn;
            } else {
                this.getter = parsePath(expOrFn);
                if (!this.getter) {
                    this.getter = noop;
                    warn(
                        "Failed watching path: \"" + expOrFn + "\" " +
                        'Watcher only accepts simple dot-delimited paths. ' +
                        'For full control, use a function instead.',
                        vm);
                }
            }
            this.value = this.lazy
                 ? undefined
                 : this.get();
        };

        /**
		 * Evaluate the getter, and re-collect dependencies.
		 */
        Watcher.prototype.get = function get() {
            pushTarget(this);
            var value;
            var vm = this.vm;
            try {
                value = this.getter.call(vm, vm);
            } catch (e) {
                if (this.user) {
                    handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
                } else {
                    throw e
                }
            }
            finally {
                // "touch" every property so they are all tracked as
                // dependencies for deep watching
                if (this.deep) {
                    traverse(value);
                }
                popTarget();
                this.cleanupDeps();
            }
            return value
        };

        /**
		 * Add a dependency to this directive.
		 */
        Watcher.prototype.addDep = function addDep(dep) {
            var id = dep.id;
            if (!this.newDepIds.has(id)) {
                this.newDepIds.add(id);
                this.newDeps.push(dep);
                if (!this.depIds.has(id)) {
                    dep.addSub(this);
                }
            }
        };

        /**
		 * Clean up for dependency collection.
		 */
        Watcher.prototype.cleanupDeps = function cleanupDeps() {
            var i = this.deps.length;
            while (i--) {
                var dep = this.deps[i];
                if (!this.newDepIds.has(dep.id)) {
                    dep.removeSub(this);
                }
            }
            var tmp = this.depIds;
            this.depIds = this.newDepIds;
            this.newDepIds = tmp;
            this.newDepIds.clear();
            tmp = this.deps;
            this.deps = this.newDeps;
            this.newDeps = tmp;
            this.newDeps.length = 0;
        };

        /**
		 * Subscriber interface. Will be called when a dependency changes.
		 */
        Watcher.prototype.update = function update() {
            /* istanbul ignore else */
            if (this.lazy) {
                this.dirty = true;
            } else if (this.sync) {
                this.run();
            } else {
                queueWatcher(this);
            }
        };

        /**
		 * Scheduler job interface. Will be called by the scheduler.
		 */
        Watcher.prototype.run = function run() {
            if (this.active) {
                var value = this.get();
                if (
                    value !== this.value ||
                    // Deep watchers and watchers on Object/Arrays should fire
					// even
                    // when the value is the same, because the value may
                    // have mutated.
                    isObject(value) ||
                    this.deep) {
                    // set new value
                    var oldValue = this.value;
                    this.value = value;
                    if (this.user) {
                        try {
                            this.cb.call(this.vm, value, oldValue);
                        } catch (e) {
                            handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
                        }
                    } else {
                        this.cb.call(this.vm, value, oldValue);
                    }
                }
            }
        };

        /**
		 * Evaluate the value of the watcher. This only gets called for lazy
		 * watchers.
		 */
        Watcher.prototype.evaluate = function evaluate() {
            this.value = this.get();
            this.dirty = false;
        };

        /**
		 * Depend on all deps collected by this watcher.
		 */
        Watcher.prototype.depend = function depend() {
            var i = this.deps.length;
            while (i--) {
                this.deps[i].depend();
            }
        };

        /**
		 * Remove self from all dependencies' subscriber list.
		 */
        Watcher.prototype.teardown = function teardown() {
            if (this.active) {
                // remove self from vm's watcher list
                // this is a somewhat expensive operation so we skip it
                // if the vm is being destroyed.
                if (!this.vm._isBeingDestroyed) {
                    remove(this.vm._watchers, this);
                }
                var i = this.deps.length;
                while (i--) {
                    this.deps[i].removeSub(this);
                }
                this.active = false;
            }
        };

        /*  */

        var sharedPropertyDefinition = {
            enumerable: true,
            configurable: true,
            get: noop,
            set: noop
        };

        function proxy(target, sourceKey, key) {
            sharedPropertyDefinition.get = function proxyGetter() {
                return this[sourceKey][key]
            };
            sharedPropertyDefinition.set = function proxySetter(val) {
                this[sourceKey][key] = val;
            };
            Object.defineProperty(target, key, sharedPropertyDefinition);
        }

        function initState(vm) {
            vm._watchers = [];
            var opts = vm.$options;
            if (opts.props) {
                initProps(vm, opts.props);
            }
            if (opts.methods) {
                initMethods(vm, opts.methods);
            }
            if (opts.data) {
                initData(vm);
            } else {
                observe(vm._data = {}, true /* asRootData */);
            }
            if (opts.computed) {
                initComputed(vm, opts.computed);
            }
            if (opts.watch && opts.watch !== nativeWatch) {
                initWatch(vm, opts.watch);
            }
        }

        function initProps(vm, propsOptions) {
            var propsData = vm.$options.propsData || {};
            var props = vm._props = {};
            // cache prop keys so that future props updates can iterate using
			// Array
            // instead of dynamic object key enumeration.
            var keys = vm.$options._propKeys = [];
            var isRoot = !vm.$parent;
            // root instance props should be converted
            if (!isRoot) {
                toggleObserving(false);
            }
            var loop = function (key) {
                keys.push(key);
                var value = validateProp(key, propsOptions, propsData, vm);
                /* istanbul ignore else */
                {
                    var hyphenatedKey = hyphenate(key);
                    if (isReservedAttribute(hyphenatedKey) ||
                        config.isReservedAttr(hyphenatedKey)) {
                        warn(
                            ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
                            vm);
                    }
                    defineReactive$$1(props, key, value, function () {
                        if (!isRoot && !isUpdatingChildComponent) {
                            warn(
                                "Avoid mutating a prop directly since the value will be " +
                                "overwritten whenever the parent component re-renders. " +
                                "Instead, use a data or computed property based on the prop's " +
                                "value. Prop being mutated: \"" + key + "\"",
                                vm);
                        }
                    });
                }
                // static props are already proxied on the component's prototype
                // during Vue.extend(). We only need to proxy props defined at
                // instantiation here.
                if (!(key in vm)) {
                    proxy(vm, "_props", key);
                }
            };

            for (var key in propsOptions)
                loop(key);
            toggleObserving(true);
        }

        function initData(vm) {
            var data = vm.$options.data;
            data = vm._data = typeof data === 'function'
                 ? getData(data, vm)
                 : data || {};
            if (!isPlainObject(data)) {
                data = {};
                warn(
                    'data functions should return an object:\n' +
                    'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
                    vm);
            }
            // proxy data on instance
            var keys = Object.keys(data);
            var props = vm.$options.props;
            var methods = vm.$options.methods;
            var i = keys.length;
            while (i--) {
                var key = keys[i];{
                    if (methods && hasOwn(methods, key)) {
                        warn(
                            ("Method \"" + key + "\" has already been defined as a data property."),
                            vm);
                    }
                }
                if (props && hasOwn(props, key)) {
                    warn(
                        "The data property \"" + key + "\" is already declared as a prop. " +
                        "Use prop default value instead.",
                        vm);
                } else if (!isReserved(key)) {
                    proxy(vm, "_data", key);
                }
            }
            // observe data
            observe(data, true /* asRootData */);
        }

        function getData(data, vm) {
            // #7573 disable dep collection when invoking data getters
            pushTarget();
            try {
                return data.call(vm, vm)
            } catch (e) {
                handleError(e, vm, "data()");
                return {}
            }
            finally {
                popTarget();
            }
        }

        var computedWatcherOptions = {
            lazy: true
        };

        function initComputed(vm, computed) {
            // $flow-disable-line
            var watchers = vm._computedWatchers = Object.create(null);
            // computed properties are just getters during SSR
            var isSSR = isServerRendering();

            for (var key in computed) {
                var userDef = computed[key];
                var getter = typeof userDef === 'function' ? userDef : userDef.get;
                if (getter == null) {
                    warn(
                        ("Getter is missing for computed property \"" + key + "\"."),
                        vm);
                }

                if (!isSSR) {
                    // create internal watcher for the computed property.
                    watchers[key] = new Watcher(
                            vm,
                            getter || noop,
                            noop,
                            computedWatcherOptions);
                }

                // component-defined computed properties are already defined on
				// the
                // component prototype. We only need to define computed
				// properties
                // defined
                // at instantiation here.
                if (!(key in vm)) {
                    defineComputed(vm, key, userDef);
                } else {
                    if (key in vm.$data) {
                        warn(("The computed property \"" + key + "\" is already defined in data."), vm);
                    } else if (vm.$options.props && key in vm.$options.props) {
                        warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
                    }
                }
            }
        }

        function defineComputed(
            target,
            key,
            userDef) {
            var shouldCache = !isServerRendering();
            if (typeof userDef === 'function') {
                sharedPropertyDefinition.get = shouldCache
                     ? createComputedGetter(key)
                     : createGetterInvoker(userDef);
                sharedPropertyDefinition.set = noop;
            } else {
                sharedPropertyDefinition.get = userDef.get
                     ? shouldCache && userDef.cache !== false
                     ? createComputedGetter(key)
                     : createGetterInvoker(userDef.get)
                     : noop;
                sharedPropertyDefinition.set = userDef.set || noop;
            }
            if (sharedPropertyDefinition.set === noop) {
                sharedPropertyDefinition.set = function () {
                    warn(
                        ("Computed property \"" + key + "\" was assigned to but it has no setter."),
                        this);
                };
            }
            Object.defineProperty(target, key, sharedPropertyDefinition);
        }

        function createComputedGetter(key) {
            return function computedGetter() {
                var watcher = this._computedWatchers && this._computedWatchers[key];
                if (watcher) {
                    if (watcher.dirty) {
                        watcher.evaluate();
                    }
                    if (Dep.target) {
                        watcher.depend();
                    }
                    return watcher.value
                }
            }
        }

        function createGetterInvoker(fn) {
            return function computedGetter() {
                return fn.call(this, this)
            }
        }

        function initMethods(vm, methods) {
            var props = vm.$options.props;
            for (var key in methods) { {
                    if (typeof methods[key] !== 'function') {
                        warn(
                            "Method \"" + key + "\" has type \"" + (typeof methods[key]) + "\" in the component definition. " +
                            "Did you reference the function correctly?",
                            vm);
                    }
                    if (props && hasOwn(props, key)) {
                        warn(
                            ("Method \"" + key + "\" has already been defined as a prop."),
                            vm);
                    }
                    if ((key in vm) && isReserved(key)) {
                        warn(
                            "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
                            "Avoid defining component methods that start with _ or $.");
                    }
                }
                vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm);
            }
        }

        function initWatch(vm, watch) {
            for (var key in watch) {
                var handler = watch[key];
                if (Array.isArray(handler)) {
                    for (var i = 0; i < handler.length; i++) {
                        createWatcher(vm, key, handler[i]);
                    }
                } else {
                    createWatcher(vm, key, handler);
                }
            }
        }

        function createWatcher(
            vm,
            expOrFn,
            handler,
            options) {
            if (isPlainObject(handler)) {
                options = handler;
                handler = handler.handler;
            }
            if (typeof handler === 'string') {
                handler = vm[handler];
            }
            return vm.$watch(expOrFn, handler, options)
        }

        function stateMixin(Vue) {
            // flow somehow has problems with directly declared definition
			// object
            // when using Object.defineProperty, so we have to procedurally
			// build up
            // the object here.
            var dataDef = {};
            dataDef.get = function () {
                return this._data
            };
            var propsDef = {};
            propsDef.get = function () {
                return this._props
            };{
                dataDef.set = function () {
                    warn(
                        'Avoid replacing instance root $data. ' +
                        'Use nested data properties instead.',
                        this);
                };
                propsDef.set = function () {
                    warn("$props is readonly.", this);
                };
            }
            Object.defineProperty(Vue.prototype, '$data', dataDef);
            Object.defineProperty(Vue.prototype, '$props', propsDef);

            Vue.prototype.$set = set;
            Vue.prototype.$delete = del;

            Vue.prototype.$watch = function (
                expOrFn,
                cb,
                options) {
                var vm = this;
                if (isPlainObject(cb)) {
                    return createWatcher(vm, expOrFn, cb, options)
                }
                options = options || {};
                options.user = true;
                var watcher = new Watcher(vm, expOrFn, cb, options);
                if (options.immediate) {
                    try {
                        cb.call(vm, watcher.value);
                    } catch (error) {
                        handleError(error, vm, ("callback for immediate watcher \"" + (watcher.expression) + "\""));
                    }
                }
                return function unwatchFn() {
                    watcher.teardown();
                }
            };
        }

        /*  */

        var uid$3 = 0;

        function initMixin(Vue) {
            Vue.prototype._init = function (options) {
                var vm = this;
                // a uid
                vm._uid = uid$3++;

                var startTag,
                endTag;
                /* istanbul ignore if */
                if (config.performance && mark) {
                    startTag = "vue-perf-start:" + (vm._uid);
                    endTag = "vue-perf-end:" + (vm._uid);
                    mark(startTag);
                }

                // a flag to avoid this being observed
                vm._isVue = true;
                // merge options
                if (options && options._isComponent) {
                    // optimize internal component instantiation
                    // since dynamic options merging is pretty slow, and none of
					// the
                    // internal component options needs special treatment.
                    initInternalComponent(vm, options);
                } else {
                    vm.$options = mergeOptions(
                            resolveConstructorOptions(vm.constructor),
                            options || {},
                            vm);
                }
                /* istanbul ignore else */
                {
                    initProxy(vm);
                }
                // expose real self
                vm._self = vm;
                initLifecycle(vm);
                initEvents(vm);
                initRender(vm);
                callHook(vm, 'beforeCreate');
                initInjections(vm); // resolve injections before data/props
                initState(vm);
                initProvide(vm); // resolve provide after data/props
                callHook(vm, 'created');

                /* istanbul ignore if */
                if (config.performance && mark) {
                    vm._name = formatComponentName(vm, false);
                    mark(endTag);
                    measure(("vue " + (vm._name) + " init"), startTag, endTag);
                }

                if (vm.$options.el) {
                    vm.$mount(vm.$options.el);
                }
            };
        }

        function initInternalComponent(vm, options) {
            var opts = vm.$options = Object.create(vm.constructor.options);
            // doing this because it's faster than dynamic enumeration.
            var parentVnode = options._parentVnode;
            opts.parent = options.parent;
            opts._parentVnode = parentVnode;

            var vnodeComponentOptions = parentVnode.componentOptions;
            opts.propsData = vnodeComponentOptions.propsData;
            opts._parentListeners = vnodeComponentOptions.listeners;
            opts._renderChildren = vnodeComponentOptions.children;
            opts._componentTag = vnodeComponentOptions.tag;

            if (options.render) {
                opts.render = options.render;
                opts.staticRenderFns = options.staticRenderFns;
            }
        }

        function resolveConstructorOptions(Ctor) {
            var options = Ctor.options;
            if (Ctor.super) {
                var superOptions = resolveConstructorOptions(Ctor.super);
                var cachedSuperOptions = Ctor.superOptions;
                if (superOptions !== cachedSuperOptions) {
                    // super option changed,
                    // need to resolve new options.
                    Ctor.superOptions = superOptions;
                    // check if there are any late-modified/attached options
					// (#4976)
                    var modifiedOptions = resolveModifiedOptions(Ctor);
                    // update base extend options
                    if (modifiedOptions) {
                        extend(Ctor.extendOptions, modifiedOptions);
                    }
                    options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
                    if (options.name) {
                        options.components[options.name] = Ctor;
                    }
                }
            }
            return options
        }

        function resolveModifiedOptions(Ctor) {
            var modified;
            var latest = Ctor.options;
            var sealed = Ctor.sealedOptions;
            for (var key in latest) {
                if (latest[key] !== sealed[key]) {
                    if (!modified) {
                        modified = {};
                    }
                    modified[key] = latest[key];
                }
            }
            return modified
        }

        function Vue(options) {
            if (!(this instanceof Vue)) {
                warn('Vue is a constructor and should be called with the `new` keyword');
            }
            this._init(options);
        }

        initMixin(Vue);
        stateMixin(Vue);
        eventsMixin(Vue);
        lifecycleMixin(Vue);
        renderMixin(Vue);

        /*  */

        function initUse(Vue) {
            Vue.use = function (plugin) {
                var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
                if (installedPlugins.indexOf(plugin) > -1) {
                    return this
                }

                // additional parameters
                var args = toArray(arguments, 1);
                args.unshift(this);
                if (typeof plugin.install === 'function') {
                    plugin.install.apply(plugin, args);
                } else if (typeof plugin === 'function') {
                    plugin.apply(null, args);
                }
                installedPlugins.push(plugin);
                return this
            };
        }

        /*  */

        function initMixin$1(Vue) {
            Vue.mixin = function (mixin) {
                this.options = mergeOptions(this.options, mixin);
                return this
            };
        }

        /*  */

        function initExtend(Vue) {
            /**
			 * Each instance constructor, including Vue, has a unique cid. This
			 * enables us to create wrapped "child constructors" for prototypal
			 * inheritance and cache them.
			 */
            Vue.cid = 0;
            var cid = 1;

            /**
			 * Class inheritance
			 */
            Vue.extend = function (extendOptions) {
                extendOptions = extendOptions || {};
                var Super = this;
                var SuperId = Super.cid;
                var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
                if (cachedCtors[SuperId]) {
                    return cachedCtors[SuperId]
                }

                var name = extendOptions.name || Super.options.name;
                if (name) {
                    validateComponentName(name);
                }

                var Sub = function VueComponent(options) {
                    this._init(options);
                };
                Sub.prototype = Object.create(Super.prototype);
                Sub.prototype.constructor = Sub;
                Sub.cid = cid++;
                Sub.options = mergeOptions(
                        Super.options,
                        extendOptions);
                Sub['super'] = Super;

                // For props and computed properties, we define the proxy
				// getters on
                // the Vue instances at extension time, on the extended
				// prototype. This
                // avoids Object.defineProperty calls for each instance created.
                if (Sub.options.props) {
                    initProps$1(Sub);
                }
                if (Sub.options.computed) {
                    initComputed$1(Sub);
                }

                // allow further extension/mixin/plugin usage
                Sub.extend = Super.extend;
                Sub.mixin = Super.mixin;
                Sub.use = Super.use;

                // create asset registers, so extended classes
                // can have their private assets too.
                ASSET_TYPES.forEach(function (type) {
                    Sub[type] = Super[type];
                });
                // enable recursive self-lookup
                if (name) {
                    Sub.options.components[name] = Sub;
                }

                // keep a reference to the super options at extension time.
                // later at instantiation we can check if Super's options have
                // been updated.
                Sub.superOptions = Super.options;
                Sub.extendOptions = extendOptions;
                Sub.sealedOptions = extend({}, Sub.options);

                // cache constructor
                cachedCtors[SuperId] = Sub;
                return Sub
            };
        }

        function initProps$1(Comp) {
            var props = Comp.options.props;
            for (var key in props) {
                proxy(Comp.prototype, "_props", key);
            }
        }

        function initComputed$1(Comp) {
            var computed = Comp.options.computed;
            for (var key in computed) {
                defineComputed(Comp.prototype, key, computed[key]);
            }
        }

        /*  */

        function initAssetRegisters(Vue) {
            /**
			 * Create asset registration methods.
			 */
            ASSET_TYPES.forEach(function (type) {
                Vue[type] = function (
                    id,
                    definition) {
                    if (!definition) {
                        return this.options[type + 's'][id]
                    } else {
                        /* istanbul ignore if */
                        if (type === 'component') {
                            validateComponentName(id);
                        }
                        if (type === 'component' && isPlainObject(definition)) {
                            definition.name = definition.name || id;
                            definition = this.options._base.extend(definition);
                        }
                        if (type === 'directive' && typeof definition === 'function') {
                            definition = {
                                bind: definition,
                                update: definition
                            };
                        }
                        this.options[type + 's'][id] = definition;
                        return definition
                    }
                };
            });
        }

        /*  */

        function getComponentName(opts) {
            return opts && (opts.Ctor.options.name || opts.tag)
        }

        function matches(pattern, name) {
            if (Array.isArray(pattern)) {
                return pattern.indexOf(name) > -1
            } else if (typeof pattern === 'string') {
                return pattern.split(',').indexOf(name) > -1
            } else if (isRegExp(pattern)) {
                return pattern.test(name)
            }
            /* istanbul ignore next */
            return false
        }

        function pruneCache(keepAliveInstance, filter) {
            var cache = keepAliveInstance.cache;
            var keys = keepAliveInstance.keys;
            var _vnode = keepAliveInstance._vnode;
            for (var key in cache) {
                var cachedNode = cache[key];
                if (cachedNode) {
                    var name = getComponentName(cachedNode.componentOptions);
                    if (name && !filter(name)) {
                        pruneCacheEntry(cache, key, keys, _vnode);
                    }
                }
            }
        }

        function pruneCacheEntry(
            cache,
            key,
            keys,
            current) {
            var cached$$1 = cache[key];
            if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {
                cached$$1.componentInstance.$destroy();
            }
            cache[key] = null;
            remove(keys, key);
        }

        var patternTypes = [String, RegExp, Array];

        var KeepAlive = {
            name: 'keep-alive',
            abstract: true,

            props: {
                include: patternTypes,
                exclude: patternTypes,
                max: [String, Number]
            },

            created: function created() {
                this.cache = Object.create(null);
                this.keys = [];
            },

            destroyed: function destroyed() {
                for (var key in this.cache) {
                    pruneCacheEntry(this.cache, key, this.keys);
                }
            },

            mounted: function mounted() {
                var this$1 = this;

                this.$watch('include', function (val) {
                    pruneCache(this$1, function (name) {
                        return matches(val, name);
                    });
                });
                this.$watch('exclude', function (val) {
                    pruneCache(this$1, function (name) {
                        return !matches(val, name);
                    });
                });
            },

            render: function render() {
                var slot = this.$slots.default;
                var vnode = getFirstComponentChild(slot);
                var componentOptions = vnode && vnode.componentOptions;
                if (componentOptions) {
                    // check pattern
                    var name = getComponentName(componentOptions);
                    var ref = this;
                    var include = ref.include;
                    var exclude = ref.exclude;
                    if (
                        // not included
                        (include && (!name || !matches(include, name))) ||
                        // excluded
                        (exclude && name && matches(exclude, name))) {
                        return vnode
                    }

                    var ref$1 = this;
                    var cache = ref$1.cache;
                    var keys = ref$1.keys;
                    var key = vnode.key == null
                        // same constructor may get registered as different
						// local components
                        // so cid alone is not enough (#3269)
                         ? componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '')
                         : vnode.key;
                    if (cache[key]) {
                        vnode.componentInstance = cache[key].componentInstance;
                        // make current key freshest
                        remove(keys, key);
                        keys.push(key);
                    } else {
                        cache[key] = vnode;
                        keys.push(key);
                        // prune oldest entry
                        if (this.max && keys.length > parseInt(this.max)) {
                            pruneCacheEntry(cache, keys[0], keys, this._vnode);
                        }
                    }

                    vnode.data.keepAlive = true;
                }
                return vnode || (slot && slot[0])
            }
        };

        var builtInComponents = {
            KeepAlive: KeepAlive
        };

        /*  */

        function initGlobalAPI(Vue) {
            // config
            var configDef = {};
            configDef.get = function () {
                return config;
            };{
                configDef.set = function () {
                    warn(
                        'Do not replace the Vue.config object, set individual fields instead.');
                };
            }
            Object.defineProperty(Vue, 'config', configDef);

            // exposed util methods.
            // NOTE: these are not considered part of the public API - avoid
			// relying on
            // them unless you are aware of the risk.
            Vue.util = {
                warn: warn,
                extend: extend,
                mergeOptions: mergeOptions,
                defineReactive: defineReactive$$1
            };

            Vue.set = set;
            Vue.delete = del;
            Vue.nextTick = nextTick;

            // 2.6 explicit observable API
            Vue.observable = function (obj) {
                observe(obj);
                return obj
            };

            Vue.options = Object.create(null);
            ASSET_TYPES.forEach(function (type) {
                Vue.options[type + 's'] = Object.create(null);
            });

            // this is used to identify the "base" constructor to extend all
            // plain-object
            // components with in Weex's multi-instance scenarios.
            Vue.options._base = Vue;

            extend(Vue.options.components, builtInComponents);

            initUse(Vue);
            initMixin$1(Vue);
            initExtend(Vue);
            initAssetRegisters(Vue);
        }

        initGlobalAPI(Vue);

        Object.defineProperty(Vue.prototype, '$isServer', {
            get: isServerRendering
        });

        Object.defineProperty(Vue.prototype, '$ssrContext', {
            get: function get() {
                /* istanbul ignore next */
                return this.$vnode && this.$vnode.ssrContext
            }
        });

        // expose FunctionalRenderContext for ssr runtime helper installation
        Object.defineProperty(Vue, 'FunctionalRenderContext', {
            value: FunctionalRenderContext
        });

        Vue.version = '2.6.12';

        /*  */

        // these are reserved for web because they are directly compiled away
        // during template compilation
        var isReservedAttr = makeMap('style,class');

        // attributes that should be using props for binding
        var acceptValue = makeMap('input,textarea,option,select,progress');
        var mustUseProp = function (tag, type, attr) {
            return (
                (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
                (attr === 'selected' && tag === 'option') ||
                (attr === 'checked' && tag === 'input') ||
                (attr === 'muted' && tag === 'video'))
        };

        var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');

        var isValidContentEditableValue = makeMap('events,caret,typing,plaintext-only');

        var convertEnumeratedValue = function (key, value) {
            return isFalsyAttrValue(value) || value === 'false'
             ? 'false'
            // allow arbitrary string value for contenteditable
             : key === 'contenteditable' && isValidContentEditableValue(value)
             ? value
             : 'true'
        };

        var isBooleanAttr = makeMap(
                'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
                'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
                'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
                'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
                'required,reversed,scoped,seamless,selected,sortable,translate,' +
                'truespeed,typemustmatch,visible');

        var xlinkNS = 'http://www.w3.org/1999/xlink';

        var isXlink = function (name) {
            return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
        };

        var getXlinkProp = function (name) {
            return isXlink(name) ? name.slice(6, name.length) : ''
        };

        var isFalsyAttrValue = function (val) {
            return val == null || val === false
        };

        /*  */

        function genClassForVnode(vnode) {
            var data = vnode.data;
            var parentNode = vnode;
            var childNode = vnode;
            while (isDef(childNode.componentInstance)) {
                childNode = childNode.componentInstance._vnode;
                if (childNode && childNode.data) {
                    data = mergeClassData(childNode.data, data);
                }
            }
            while (isDef(parentNode = parentNode.parent)) {
                if (parentNode && parentNode.data) {
                    data = mergeClassData(data, parentNode.data);
                }
            }
            return renderClass(data.staticClass, data.class)
        }

        function mergeClassData(child, parent) {
            return {
                staticClass: concat(child.staticClass, parent.staticClass),
                class: isDef(child.class)
                 ? [child.class, parent.class]
                 : parent.class
            }
        }

        function renderClass(
            staticClass,
            dynamicClass) {
            if (isDef(staticClass) || isDef(dynamicClass)) {
                return concat(staticClass, stringifyClass(dynamicClass))
            }
            /* istanbul ignore next */
            return ''
        }

        function concat(a, b) {
            return a ? b ? (a + ' ' + b) : a : (b || '')
        }

        function stringifyClass(value) {
            if (Array.isArray(value)) {
                return stringifyArray(value)
            }
            if (isObject(value)) {
                return stringifyObject(value)
            }
            if (typeof value === 'string') {
                return value
            }
            /* istanbul ignore next */
            return ''
        }

        function stringifyArray(value) {
            var res = '';
            var stringified;
            for (var i = 0, l = value.length; i < l; i++) {
                if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
                    if (res) {
                        res += ' ';
                    }
                    res += stringified;
                }
            }
            return res
        }

        function stringifyObject(value) {
            var res = '';
            for (var key in value) {
                if (value[key]) {
                    if (res) {
                        res += ' ';
                    }
                    res += key;
                }
            }
            return res
        }

        /*  */

        var namespaceMap = {
            svg: 'http://www.w3.org/2000/svg',
            math: 'http://www.w3.org/1998/Math/MathML'
        };

        var isHTMLTag = makeMap(
                'html,body,base,head,link,meta,style,title,' +
                'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
                'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
                'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
                's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
                'embed,object,param,source,canvas,script,noscript,del,ins,' +
                'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
                'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
                'output,progress,select,textarea,' +
                'details,dialog,menu,menuitem,summary,' +
                'content,element,shadow,template,blockquote,iframe,tfoot');

        // this map is intentionally selective, only covering SVG elements that
		// may
        // contain child elements.
        var isSVG = makeMap(
                'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
                'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
                'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
                true);

        var isPreTag = function (tag) {
            return tag === 'pre';
        };

        var isReservedTag = function (tag) {
            return isHTMLTag(tag) || isSVG(tag)
        };

        function getTagNamespace(tag) {
            if (isSVG(tag)) {
                return 'svg'
            }
            // basic support for MathML
            // note it doesn't support other MathML elements being component
			// roots
            if (tag === 'math') {
                return 'math'
            }
        }

        var unknownElementCache = Object.create(null);
        function isUnknownElement(tag) {
            /* istanbul ignore if */
            if (!inBrowser) {
                return true
            }
            if (isReservedTag(tag)) {
                return false
            }
            tag = tag.toLowerCase();
            /* istanbul ignore if */
            if (unknownElementCache[tag] != null) {
                return unknownElementCache[tag]
            }
            var el = document.createElement(tag);
            if (tag.indexOf('-') > -1) {
                // http://stackoverflow.com/a/28210364/1070244
                return (unknownElementCache[tag] = (
                        el.constructor === window.HTMLUnknownElement ||
                        el.constructor === window.HTMLElement))
            } else {
                return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
            }
        }

        var isTextInputType = makeMap('text,number,password,search,email,tel,url');

        /*  */

        /**
		 * Query an element selector if it's not an element already.
		 */
        function query(el) {
            if (typeof el === 'string') {
                var selected = document.querySelector(el);
                if (!selected) {
                    warn(
                        'Cannot find element: ' + el);
                    return document.createElement('div')
                }
                return selected
            } else {
                return el
            }
        }

        /*  */

        function createElement$1(tagName, vnode) {
            var elm = document.createElement(tagName);
            if (tagName !== 'select') {
                return elm
            }
            // false or null will remove the attribute but undefined will not
            if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
                elm.setAttribute('multiple', 'multiple');
            }
            return elm
        }

        function createElementNS(namespace, tagName) {
            return document.createElementNS(namespaceMap[namespace], tagName)
        }

        function createTextNode(text) {
            return document.createTextNode(text)
        }

        function createComment(text) {
            return document.createComment(text)
        }

        function insertBefore(parentNode, newNode, referenceNode) {
            parentNode.insertBefore(newNode, referenceNode);
        }

        function removeChild(node, child) {
            node.removeChild(child);
        }

        function appendChild(node, child) {
            node.appendChild(child);
        }

        function parentNode(node) {
            return node.parentNode
        }

        function nextSibling(node) {
            return node.nextSibling
        }

        function tagName(node) {
            return node.tagName
        }

        function setTextContent(node, text) {
            node.textContent = text;
        }

        function setStyleScope(node, scopeId) {
            node.setAttribute(scopeId, '');
        }

        var nodeOps = /* #__PURE__ */ Object.freeze({
                createElement: createElement$1,
                createElementNS: createElementNS,
                createTextNode: createTextNode,
                createComment: createComment,
                insertBefore: insertBefore,
                removeChild: removeChild,
                appendChild: appendChild,
                parentNode: parentNode,
                nextSibling: nextSibling,
                tagName: tagName,
                setTextContent: setTextContent,
                setStyleScope: setStyleScope
            });

        /*  */

        var ref = {
            create: function create(_, vnode) {
                registerRef(vnode);
            },
            update: function update(oldVnode, vnode) {
                if (oldVnode.data.ref !== vnode.data.ref) {
                    registerRef(oldVnode, true);
                    registerRef(vnode);
                }
            },
            destroy: function destroy(vnode) {
                registerRef(vnode, true);
            }
        };

        function registerRef(vnode, isRemoval) {
            var key = vnode.data.ref;
            if (!isDef(key)) {
                return
            }

            var vm = vnode.context;
            var ref = vnode.componentInstance || vnode.elm;
            var refs = vm.$refs;
            if (isRemoval) {
                if (Array.isArray(refs[key])) {
                    remove(refs[key], ref);
                } else if (refs[key] === ref) {
                    refs[key] = undefined;
                }
            } else {
                if (vnode.data.refInFor) {
                    if (!Array.isArray(refs[key])) {
                        refs[key] = [ref];
                    } else if (refs[key].indexOf(ref) < 0) {
                        // $flow-disable-line
                        refs[key].push(ref);
                    }
                } else {
                    refs[key] = ref;
                }
            }
        }

        /**
		 * Virtual DOM patching algorithm based on Snabbdom by Simon Friis
		 * Vindum (@paldepind) Licensed under the MIT License
		 * https://github.com/paldepind/snabbdom/blob/master/LICENSE
		 * 
		 * modified by Evan You (@yyx990803)
		 * 
		 * Not type-checking this because this file is perf-critical and the
		 * cost of making flow understand it is not worth it.
		 */

        var emptyNode = new VNode('', {}, []);

        var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];

        function sameVnode(a, b) {
            return (
                a.key === b.key && (
                    (
                        a.tag === b.tag &&
                        a.isComment === b.isComment &&
                        isDef(a.data) === isDef(b.data) &&
                        sameInputType(a, b)) || (
                        isTrue(a.isAsyncPlaceholder) &&
                        a.asyncFactory === b.asyncFactory &&
                        isUndef(b.asyncFactory.error))))
        }

        function sameInputType(a, b) {
            if (a.tag !== 'input') {
                return true
            }
            var i;
            var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
            var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
            return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
        }

        function createKeyToOldIdx(children, beginIdx, endIdx) {
            var i,
            key;
            var map = {};
            for (i = beginIdx; i <= endIdx; ++i) {
                key = children[i].key;
                if (isDef(key)) {
                    map[key] = i;
                }
            }
            return map
        }

        function createPatchFunction(backend) {
            var i,
            j;
            var cbs = {};

            var modules = backend.modules;
            var nodeOps = backend.nodeOps;

            for (i = 0; i < hooks.length; ++i) {
                cbs[hooks[i]] = [];
                for (j = 0; j < modules.length; ++j) {
                    if (isDef(modules[j][hooks[i]])) {
                        cbs[hooks[i]].push(modules[j][hooks[i]]);
                    }
                }
            }

            function emptyNodeAt(elm) {
                return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
            }

            function createRmCb(childElm, listeners) {
                function remove$$1() {
                    if (--remove$$1.listeners === 0) {
                        removeNode(childElm);
                    }
                }
                remove$$1.listeners = listeners;
                return remove$$1
            }

            function removeNode(el) {
                var parent = nodeOps.parentNode(el);
                // element may have already been removed due to v-html / v-text
                if (isDef(parent)) {
                    nodeOps.removeChild(parent, el);
                }
            }

            function isUnknownElement$$1(vnode, inVPre) {
                return (
                    !inVPre &&
                    !vnode.ns &&
                    !(
                        config.ignoredElements.length &&
                        config.ignoredElements.some(function (ignore) {
                            return isRegExp(ignore)
                             ? ignore.test(vnode.tag)
                             : ignore === vnode.tag
                        })) &&
                    config.isUnknownElement(vnode.tag))
            }

            var creatingElmInVPre = 0;

            function createElm(
                vnode,
                insertedVnodeQueue,
                parentElm,
                refElm,
                nested,
                ownerArray,
                index) {
                if (isDef(vnode.elm) && isDef(ownerArray)) {
                    // This vnode was used in a previous render!
                    // now it's used as a new node, overwriting its elm would
					// cause
                    // potential patch errors down the road when it's used as an
					// insertion
                    // reference node. Instead, we clone the node on-demand
					// before creating
                    // associated DOM element for it.
                    vnode = ownerArray[index] = cloneVNode(vnode);
                }

                vnode.isRootInsert = !nested; // for transition enter check
                if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
                    return
                }

                var data = vnode.data;
                var children = vnode.children;
                var tag = vnode.tag;
                if (isDef(tag)) { {
                        if (data && data.pre) {
                            creatingElmInVPre++;
                        }
                        if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
                            warn(
                                'Unknown custom element: <' + tag + '> - did you ' +
                                'register the component correctly? For recursive components, ' +
                                'make sure to provide the "name" option.',
                                vnode.context);
                        }
                    }

                    vnode.elm = vnode.ns
                         ? nodeOps.createElementNS(vnode.ns, tag)
                         : nodeOps.createElement(tag, vnode);
                    setScope(vnode);

                    /* istanbul ignore if */
                    {
                        createChildren(vnode, children, insertedVnodeQueue);
                        if (isDef(data)) {
                            invokeCreateHooks(vnode, insertedVnodeQueue);
                        }
                        insert(parentElm, vnode.elm, refElm);
                    }

                    if (data && data.pre) {
                        creatingElmInVPre--;
                    }
                } else if (isTrue(vnode.isComment)) {
                    vnode.elm = nodeOps.createComment(vnode.text);
                    insert(parentElm, vnode.elm, refElm);
                } else {
                    vnode.elm = nodeOps.createTextNode(vnode.text);
                    insert(parentElm, vnode.elm, refElm);
                }
            }

            function createComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
                var i = vnode.data;
                if (isDef(i)) {
                    var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
                    if (isDef(i = i.hook) && isDef(i = i.init)) {
                        i(vnode, false /* hydrating */);
                    }
                    // after calling the init hook, if the vnode is a child
					// component
                    // it should've created a child instance and mounted it. the
					// child
                    // component also has set the placeholder vnode's elm.
                    // in that case we can just return the element and be done.
                    if (isDef(vnode.componentInstance)) {
                        initComponent(vnode, insertedVnodeQueue);
                        insert(parentElm, vnode.elm, refElm);
                        if (isTrue(isReactivated)) {
                            reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                        }
                        return true
                    }
                }
            }

            function initComponent(vnode, insertedVnodeQueue) {
                if (isDef(vnode.data.pendingInsert)) {
                    insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
                    vnode.data.pendingInsert = null;
                }
                vnode.elm = vnode.componentInstance.$el;
                if (isPatchable(vnode)) {
                    invokeCreateHooks(vnode, insertedVnodeQueue);
                    setScope(vnode);
                } else {
                    // empty component root.
                    // skip all element-related modules except for ref (#3455)
                    registerRef(vnode);
                    // make sure to invoke the insert hook
                    insertedVnodeQueue.push(vnode);
                }
            }

            function reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
                var i;
                // hack for #4339: a reactivated component with inner transition
                // does not trigger because the inner node's created hooks are
				// not
                // called
                // again. It's not ideal to involve module-specific logic in
				// here but
                // there doesn't seem to be a better way to do it.
                var innerNode = vnode;
                while (innerNode.componentInstance) {
                    innerNode = innerNode.componentInstance._vnode;
                    if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
                        for (i = 0; i < cbs.activate.length; ++i) {
                            cbs.activate[i](emptyNode, innerNode);
                        }
                        insertedVnodeQueue.push(innerNode);
                        break
                    }
                }
                // unlike a newly created component,
                // a reactivated keep-alive component doesn't insert itself
                insert(parentElm, vnode.elm, refElm);
            }

            function insert(parent, elm, ref$$1) {
                if (isDef(parent)) {
                    if (isDef(ref$$1)) {
                        if (nodeOps.parentNode(ref$$1) === parent) {
                            nodeOps.insertBefore(parent, elm, ref$$1);
                        }
                    } else {
                        nodeOps.appendChild(parent, elm);
                    }
                }
            }

            function createChildren(vnode, children, insertedVnodeQueue) {
                if (Array.isArray(children)) { {
                        checkDuplicateKeys(children);
                    }
                    for (var i = 0; i < children.length; ++i) {
                        createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
                    }
                } else if (isPrimitive(vnode.text)) {
                    nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
                }
            }

            function isPatchable(vnode) {
                while (vnode.componentInstance) {
                    vnode = vnode.componentInstance._vnode;
                }
                return isDef(vnode.tag)
            }

            function invokeCreateHooks(vnode, insertedVnodeQueue) {
                for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                    cbs.create[i$1](emptyNode, vnode);
                }
                i = vnode.data.hook; // Reuse variable
                if (isDef(i)) {
                    if (isDef(i.create)) {
                        i.create(emptyNode, vnode);
                    }
                    if (isDef(i.insert)) {
                        insertedVnodeQueue.push(vnode);
                    }
                }
            }

            // set scope id attribute for scoped CSS.
            // this is implemented as a special case to avoid the overhead
            // of going through the normal attribute patching process.
            function setScope(vnode) {
                var i;
                if (isDef(i = vnode.fnScopeId)) {
                    nodeOps.setStyleScope(vnode.elm, i);
                } else {
                    var ancestor = vnode;
                    while (ancestor) {
                        if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                            nodeOps.setStyleScope(vnode.elm, i);
                        }
                        ancestor = ancestor.parent;
                    }
                }
                // for slot content they should also get the scopeId from the
				// host
                // instance.
                if (isDef(i = activeInstance) &&
                    i !== vnode.context &&
                    i !== vnode.fnContext &&
                    isDef(i = i.$options._scopeId)) {
                    nodeOps.setStyleScope(vnode.elm, i);
                }
            }

            function addVnodes(parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
                for (; startIdx <= endIdx; ++startIdx) {
                    createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
                }
            }

            function invokeDestroyHook(vnode) {
                var i,
                j;
                var data = vnode.data;
                if (isDef(data)) {
                    if (isDef(i = data.hook) && isDef(i = i.destroy)) {
                        i(vnode);
                    }
                    for (i = 0; i < cbs.destroy.length; ++i) {
                        cbs.destroy[i](vnode);
                    }
                }
                if (isDef(i = vnode.children)) {
                    for (j = 0; j < vnode.children.length; ++j) {
                        invokeDestroyHook(vnode.children[j]);
                    }
                }
            }

            function removeVnodes(vnodes, startIdx, endIdx) {
                for (; startIdx <= endIdx; ++startIdx) {
                    var ch = vnodes[startIdx];
                    if (isDef(ch)) {
                        if (isDef(ch.tag)) {
                            removeAndInvokeRemoveHook(ch);
                            invokeDestroyHook(ch);
                        } else { // Text node
                            removeNode(ch.elm);
                        }
                    }
                }
            }

            function removeAndInvokeRemoveHook(vnode, rm) {
                if (isDef(rm) || isDef(vnode.data)) {
                    var i;
                    var listeners = cbs.remove.length + 1;
                    if (isDef(rm)) {
                        // we have a recursively passed down rm callback
                        // increase the listeners count
                        rm.listeners += listeners;
                    } else {
                        // directly removing
                        rm = createRmCb(vnode.elm, listeners);
                    }
                    // recursively invoke hooks on child component root node
                    if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                        removeAndInvokeRemoveHook(i, rm);
                    }
                    for (i = 0; i < cbs.remove.length; ++i) {
                        cbs.remove[i](vnode, rm);
                    }
                    if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                        i(vnode, rm);
                    } else {
                        rm();
                    }
                } else {
                    removeNode(vnode.elm);
                }
            }

            function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
                var oldStartIdx = 0;
                var newStartIdx = 0;
                var oldEndIdx = oldCh.length - 1;
                var oldStartVnode = oldCh[0];
                var oldEndVnode = oldCh[oldEndIdx];
                var newEndIdx = newCh.length - 1;
                var newStartVnode = newCh[0];
                var newEndVnode = newCh[newEndIdx];
                var oldKeyToIdx,
                idxInOld,
                vnodeToMove,
                refElm;

                // removeOnly is a special flag used only by <transition-group>
                // to ensure removed elements stay in correct relative positions
                // during leaving transitions
                var canMove = !removeOnly;
                {
                    checkDuplicateKeys(newCh);
                }
                while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
                    if (isUndef(oldStartVnode)) {
                        oldStartVnode = oldCh[++oldStartIdx]; // Vnode has
																// been moved
																// left
                    } else if (isUndef(oldEndVnode)) {
                        oldEndVnode = oldCh[--oldEndIdx];
                    } else if (sameVnode(oldStartVnode, newStartVnode)) {
                        patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                        oldStartVnode = oldCh[++oldStartIdx];
                        newStartVnode = newCh[++newStartIdx];
                    } else if (sameVnode(oldEndVnode, newEndVnode)) {
                        patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                        oldEndVnode = oldCh[--oldEndIdx];
                        newEndVnode = newCh[--newEndIdx];
                    } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode
																		// moved
																		// right
                        patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue, newCh, newEndIdx);
                        canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                        oldStartVnode = oldCh[++oldStartIdx];
                        newEndVnode = newCh[--newEndIdx];
                    } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode
																		// moved
																		// left
                        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                        canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                        oldEndVnode = oldCh[--oldEndIdx];
                        newStartVnode = newCh[++newStartIdx];
                    } else {
                        if (isUndef(oldKeyToIdx)) {
                            oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
                        }
                        idxInOld = isDef(newStartVnode.key)
                             ? oldKeyToIdx[newStartVnode.key]
                             : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                        if (isUndef(idxInOld)) { // New element
                            createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                        } else {
                            vnodeToMove = oldCh[idxInOld];
                            if (sameVnode(vnodeToMove, newStartVnode)) {
                                patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue, newCh, newStartIdx);
                                oldCh[idxInOld] = undefined;
                                canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                            } else {
                                // same key but different element. treat as new
								// element
                                createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                            }
                        }
                        newStartVnode = newCh[++newStartIdx];
                    }
                }
                if (oldStartIdx > oldEndIdx) {
                    refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
                    addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
                } else if (newStartIdx > newEndIdx) {
                    removeVnodes(oldCh, oldStartIdx, oldEndIdx);
                }
            }

            function checkDuplicateKeys(children) {
                var seenKeys = {};
                for (var i = 0; i < children.length; i++) {
                    var vnode = children[i];
                    var key = vnode.key;
                    if (isDef(key)) {
                        if (seenKeys[key]) {
                            warn(
                                ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
                                vnode.context);
                        } else {
                            seenKeys[key] = true;
                        }
                    }
                }
            }

            function findIdxInOld(node, oldCh, start, end) {
                for (var i = start; i < end; i++) {
                    var c = oldCh[i];
                    if (isDef(c) && sameVnode(node, c)) {
                        return i
                    }
                }
            }

            function patchVnode(
                oldVnode,
                vnode,
                insertedVnodeQueue,
                ownerArray,
                index,
                removeOnly) {
                if (oldVnode === vnode) {
                    return
                }

                if (isDef(vnode.elm) && isDef(ownerArray)) {
                    // clone reused vnode
                    vnode = ownerArray[index] = cloneVNode(vnode);
                }

                var elm = vnode.elm = oldVnode.elm;

                if (isTrue(oldVnode.isAsyncPlaceholder)) {
                    if (isDef(vnode.asyncFactory.resolved)) {
                        hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
                    } else {
                        vnode.isAsyncPlaceholder = true;
                    }
                    return
                }

                // reuse element for static trees.
                // note we only do this if the vnode is cloned -
                // if the new node is not cloned it means the render functions
				// have been
                // reset by the hot-reload-api and we need to do a proper
				// re-render.
                if (isTrue(vnode.isStatic) &&
                    isTrue(oldVnode.isStatic) &&
                    vnode.key === oldVnode.key &&
                    (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))) {
                    vnode.componentInstance = oldVnode.componentInstance;
                    return
                }

                var i;
                var data = vnode.data;
                if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
                    i(oldVnode, vnode);
                }

                var oldCh = oldVnode.children;
                var ch = vnode.children;
                if (isDef(data) && isPatchable(vnode)) {
                    for (i = 0; i < cbs.update.length; ++i) {
                        cbs.update[i](oldVnode, vnode);
                    }
                    if (isDef(i = data.hook) && isDef(i = i.update)) {
                        i(oldVnode, vnode);
                    }
                }
                if (isUndef(vnode.text)) {
                    if (isDef(oldCh) && isDef(ch)) {
                        if (oldCh !== ch) {
                            updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly);
                        }
                    } else if (isDef(ch)) { {
                            checkDuplicateKeys(ch);
                        }
                        if (isDef(oldVnode.text)) {
                            nodeOps.setTextContent(elm, '');
                        }
                        addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
                    } else if (isDef(oldCh)) {
                        removeVnodes(oldCh, 0, oldCh.length - 1);
                    } else if (isDef(oldVnode.text)) {
                        nodeOps.setTextContent(elm, '');
                    }
                } else if (oldVnode.text !== vnode.text) {
                    nodeOps.setTextContent(elm, vnode.text);
                }
                if (isDef(data)) {
                    if (isDef(i = data.hook) && isDef(i = i.postpatch)) {
                        i(oldVnode, vnode);
                    }
                }
            }

            function invokeInsertHook(vnode, queue, initial) {
                // delay insert hooks for component root nodes, invoke them
				// after the
                // element is really inserted
                if (isTrue(initial) && isDef(vnode.parent)) {
                    vnode.parent.data.pendingInsert = queue;
                } else {
                    for (var i = 0; i < queue.length; ++i) {
                        queue[i].data.hook.insert(queue[i]);
                    }
                }
            }

            var hydrationBailed = false;
            // list of modules that can skip create hook during hydration
			// because they
            // are already rendered on the client or has no need for
			// initialization
            // Note: style is excluded because it relies on initial clone for
			// future
            // deep updates (#7063).
            var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');

            // Note: this is a browser-only function so we can assume elms are
			// DOM
            // nodes.
            function hydrate(elm, vnode, insertedVnodeQueue, inVPre) {
                var i;
                var tag = vnode.tag;
                var data = vnode.data;
                var children = vnode.children;
                inVPre = inVPre || (data && data.pre);
                vnode.elm = elm;

                if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
                    vnode.isAsyncPlaceholder = true;
                    return true
                }
                // assert node match
                {
                    if (!assertNodeMatch(elm, vnode, inVPre)) {
                        return false
                    }
                }
                if (isDef(data)) {
                    if (isDef(i = data.hook) && isDef(i = i.init)) {
                        i(vnode, true /* hydrating */);
                    }
                    if (isDef(i = vnode.componentInstance)) {
                        // child component. it should have hydrated its own
						// tree.
                        initComponent(vnode, insertedVnodeQueue);
                        return true
                    }
                }
                if (isDef(tag)) {
                    if (isDef(children)) {
                        // empty element, allow client to pick up and populate
						// children
                        if (!elm.hasChildNodes()) {
                            createChildren(vnode, children, insertedVnodeQueue);
                        } else {
                            // v-html and domProps: innerHTML
                            if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
                                if (i !== elm.innerHTML) {
                                    /* istanbul ignore if */
                                    if (typeof console !== 'undefined' &&
                                        !hydrationBailed) {
                                        hydrationBailed = true;
                                        console.warn('Parent: ', elm);
                                        console.warn('server innerHTML: ', i);
                                        console.warn('client innerHTML: ', elm.innerHTML);
                                    }
                                    return false
                                }
                            } else {
                                // iterate and compare children lists
                                var childrenMatch = true;
                                var childNode = elm.firstChild;
                                for (var i$1 = 0; i$1 < children.length; i$1++) {
                                    if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
                                        childrenMatch = false;
                                        break
                                    }
                                    childNode = childNode.nextSibling;
                                }
                                // if childNode is not null, it means the actual
								// childNodes list
                                // is
                                // longer than the virtual children list.
                                if (!childrenMatch || childNode) {
                                    /* istanbul ignore if */
                                    if (typeof console !== 'undefined' &&
                                        !hydrationBailed) {
                                        hydrationBailed = true;
                                        console.warn('Parent: ', elm);
                                        console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                                    }
                                    return false
                                }
                            }
                        }
                    }
                    if (isDef(data)) {
                        var fullInvoke = false;
                        for (var key in data) {
                            if (!isRenderedModule(key)) {
                                fullInvoke = true;
                                invokeCreateHooks(vnode, insertedVnodeQueue);
                                break
                            }
                        }
                        if (!fullInvoke && data['class']) {
                            // ensure collecting deps for deep class bindings
							// for future updates
                            traverse(data['class']);
                        }
                    }
                } else if (elm.data !== vnode.text) {
                    elm.data = vnode.text;
                }
                return true
            }

            function assertNodeMatch(node, vnode, inVPre) {
                if (isDef(vnode.tag)) {
                    return vnode.tag.indexOf('vue-component') === 0 || (
                        !isUnknownElement$$1(vnode, inVPre) &&
                        vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase()))
                } else {
                    return node.nodeType === (vnode.isComment ? 8 : 3)
                }
            }

            return function patch(oldVnode, vnode, hydrating, removeOnly) {
                if (isUndef(vnode)) {
                    if (isDef(oldVnode)) {
                        invokeDestroyHook(oldVnode);
                    }
                    return
                }

                var isInitialPatch = false;
                var insertedVnodeQueue = [];

                if (isUndef(oldVnode)) {
                    // empty mount (likely as component), create new root
					// element
                    isInitialPatch = true;
                    createElm(vnode, insertedVnodeQueue);
                } else {
                    var isRealElement = isDef(oldVnode.nodeType);
                    if (!isRealElement && sameVnode(oldVnode, vnode)) {
                        // patch existing root node
                        patchVnode(oldVnode, vnode, insertedVnodeQueue, null, null, removeOnly);
                    } else {
                        if (isRealElement) {
                            // mounting to a real element
                            // check if this is server-rendered content and if
							// we can perform
                            // a successful hydration.
                            if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                                oldVnode.removeAttribute(SSR_ATTR);
                                hydrating = true;
                            }
                            if (isTrue(hydrating)) {
                                if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                                    invokeInsertHook(vnode, insertedVnodeQueue, true);
                                    return oldVnode
                                } else {
                                    warn(
                                        'The client-side rendered virtual DOM tree is not matching ' +
                                        'server-rendered content. This is likely caused by incorrect ' +
                                        'HTML markup, for example nesting block-level elements inside ' +
                                        '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                        'full client-side render.');
                                }
                            }
                            // either not server-rendered, or hydration failed.
                            // create an empty node and replace it
                            oldVnode = emptyNodeAt(oldVnode);
                        }

                        // replacing existing element
                        var oldElm = oldVnode.elm;
                        var parentElm = nodeOps.parentNode(oldElm);

                        // create new node
                        createElm(
                            vnode,
                            insertedVnodeQueue,
                            // extremely rare edge case: do not insert if old
							// element is in a
                            // leaving transition. Only happens when combining
							// transition +
                            // keep-alive + HOCs. (#4590)
                            oldElm._leaveCb ? null : parentElm,
                            nodeOps.nextSibling(oldElm));

                        // update parent placeholder node element, recursively
                        if (isDef(vnode.parent)) {
                            var ancestor = vnode.parent;
                            var patchable = isPatchable(vnode);
                            while (ancestor) {
                                for (var i = 0; i < cbs.destroy.length; ++i) {
                                    cbs.destroy[i](ancestor);
                                }
                                ancestor.elm = vnode.elm;
                                if (patchable) {
                                    for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                                        cbs.create[i$1](emptyNode, ancestor);
                                    }
                                    // #6513
                                    // invoke insert hooks that may have been
									// merged by create
                                    // hooks.
                                    // e.g. for directives that uses the
									// "inserted" hook.
                                    var insert = ancestor.data.hook.insert;
                                    if (insert.merged) {
                                        // start at index 1 to avoid re-invoking
										// component mounted
                                        // hook
                                        for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                                            insert.fns[i$2]();
                                        }
                                    }
                                } else {
                                    registerRef(ancestor);
                                }
                                ancestor = ancestor.parent;
                            }
                        }

                        // destroy old node
                        if (isDef(parentElm)) {
                            removeVnodes([oldVnode], 0, 0);
                        } else if (isDef(oldVnode.tag)) {
                            invokeDestroyHook(oldVnode);
                        }
                    }
                }

                invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
                return vnode.elm
            }
        }

        /*  */

        var directives = {
            create: updateDirectives,
            update: updateDirectives,
            destroy: function unbindDirectives(vnode) {
                updateDirectives(vnode, emptyNode);
            }
        };

        function updateDirectives(oldVnode, vnode) {
            if (oldVnode.data.directives || vnode.data.directives) {
                _update(oldVnode, vnode);
            }
        }

        function _update(oldVnode, vnode) {
            var isCreate = oldVnode === emptyNode;
            var isDestroy = vnode === emptyNode;
            var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
            var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

            var dirsWithInsert = [];
            var dirsWithPostpatch = [];

            var key,
            oldDir,
            dir;
            for (key in newDirs) {
                oldDir = oldDirs[key];
                dir = newDirs[key];
                if (!oldDir) {
                    // new directive, bind
                    callHook$1(dir, 'bind', vnode, oldVnode);
                    if (dir.def && dir.def.inserted) {
                        dirsWithInsert.push(dir);
                    }
                } else {
                    // existing directive, update
                    dir.oldValue = oldDir.value;
                    dir.oldArg = oldDir.arg;
                    callHook$1(dir, 'update', vnode, oldVnode);
                    if (dir.def && dir.def.componentUpdated) {
                        dirsWithPostpatch.push(dir);
                    }
                }
            }

            if (dirsWithInsert.length) {
                var callInsert = function () {
                    for (var i = 0; i < dirsWithInsert.length; i++) {
                        callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
                    }
                };
                if (isCreate) {
                    mergeVNodeHook(vnode, 'insert', callInsert);
                } else {
                    callInsert();
                }
            }

            if (dirsWithPostpatch.length) {
                mergeVNodeHook(vnode, 'postpatch', function () {
                    for (var i = 0; i < dirsWithPostpatch.length; i++) {
                        callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
                    }
                });
            }

            if (!isCreate) {
                for (key in oldDirs) {
                    if (!newDirs[key]) {
                        // no longer present, unbind
                        callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
                    }
                }
            }
        }

        var emptyModifiers = Object.create(null);

        function normalizeDirectives$1(
            dirs,
            vm) {
            var res = Object.create(null);
            if (!dirs) {
                // $flow-disable-line
                return res
            }
            var i,
            dir;
            for (i = 0; i < dirs.length; i++) {
                dir = dirs[i];
                if (!dir.modifiers) {
                    // $flow-disable-line
                    dir.modifiers = emptyModifiers;
                }
                res[getRawDirName(dir)] = dir;
                dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
            }
            // $flow-disable-line
            return res
        }

        function getRawDirName(dir) {
            return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
        }

        function callHook$1(dir, hook, vnode, oldVnode, isDestroy) {
            var fn = dir.def && dir.def[hook];
            if (fn) {
                try {
                    fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
                } catch (e) {
                    handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
                }
            }
        }

        var baseModules = [
            ref,
            directives
        ];

        /*  */

        function updateAttrs(oldVnode, vnode) {
            var opts = vnode.componentOptions;
            if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
                return
            }
            if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
                return
            }
            var key,
            cur,
            old;
            var elm = vnode.elm;
            var oldAttrs = oldVnode.data.attrs || {};
            var attrs = vnode.data.attrs || {};
            // clone observed objects, as the user probably wants to mutate it
            if (isDef(attrs.__ob__)) {
                attrs = vnode.data.attrs = extend({}, attrs);
            }

            for (key in attrs) {
                cur = attrs[key];
                old = oldAttrs[key];
                if (old !== cur) {
                    setAttr(elm, key, cur);
                }
            }
            // #4391: in IE9, setting type can reset value for input[type=radio]
            // #6666: IE/Edge forces progress value down to 1 before setting a
			// max
            /* istanbul ignore if */
            if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
                setAttr(elm, 'value', attrs.value);
            }
            for (key in oldAttrs) {
                if (isUndef(attrs[key])) {
                    if (isXlink(key)) {
                        elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
                    } else if (!isEnumeratedAttr(key)) {
                        elm.removeAttribute(key);
                    }
                }
            }
        }

        function setAttr(el, key, value) {
            if (el.tagName.indexOf('-') > -1) {
                baseSetAttr(el, key, value);
            } else if (isBooleanAttr(key)) {
                // set attribute for blank value
                // e.g. <option disabled>Select one</option>
                if (isFalsyAttrValue(value)) {
                    el.removeAttribute(key);
                } else {
                    // technically allowfullscreen is a boolean attribute for
					// <iframe>,
                    // but Flash expects a value of "true" when used on <embed>
					// tag
                    value = key === 'allowfullscreen' && el.tagName === 'EMBED'
                         ? 'true'
                         : key;
                    el.setAttribute(key, value);
                }
            } else if (isEnumeratedAttr(key)) {
                el.setAttribute(key, convertEnumeratedValue(key, value));
            } else if (isXlink(key)) {
                if (isFalsyAttrValue(value)) {
                    el.removeAttributeNS(xlinkNS, getXlinkProp(key));
                } else {
                    el.setAttributeNS(xlinkNS, key, value);
                }
            } else {
                baseSetAttr(el, key, value);
            }
        }

        function baseSetAttr(el, key, value) {
            if (isFalsyAttrValue(value)) {
                el.removeAttribute(key);
            } else {
                // #7138: IE10 & 11 fires input event when setting placeholder
				// on
                // <textarea>... block the first input event and remove the
				// blocker
                // immediately.
                /* istanbul ignore if */
                if (
                    isIE && !isIE9 &&
                    el.tagName === 'TEXTAREA' &&
                    key === 'placeholder' && value !== '' && !el.__ieph) {
                    var blocker = function (e) {
                        e.stopImmediatePropagation();
                        el.removeEventListener('input', blocker);
                    };
                    el.addEventListener('input', blocker);
                    // $flow-disable-line
                    el.__ieph = true; /* IE placeholder patched */
                }
                el.setAttribute(key, value);
            }
        }

        var attrs = {
            create: updateAttrs,
            update: updateAttrs
        };

        /*  */

        function updateClass(oldVnode, vnode) {
            var el = vnode.elm;
            var data = vnode.data;
            var oldData = oldVnode.data;
            if (
                isUndef(data.staticClass) &&
                isUndef(data.class) && (
                    isUndef(oldData) || (
                        isUndef(oldData.staticClass) &&
                        isUndef(oldData.class)))) {
                return
            }

            var cls = genClassForVnode(vnode);

            // handle transition classes
            var transitionClass = el._transitionClasses;
            if (isDef(transitionClass)) {
                cls = concat(cls, stringifyClass(transitionClass));
            }

            // set the class
            if (cls !== el._prevClass) {
                el.setAttribute('class', cls);
                el._prevClass = cls;
            }
        }

        var klass = {
            create: updateClass,
            update: updateClass
        };

        /*  */

        var validDivisionCharRE = /[\w).+\-_$\]]/;

        function parseFilters(exp) {
            var inSingle = false;
            var inDouble = false;
            var inTemplateString = false;
            var inRegex = false;
            var curly = 0;
            var square = 0;
            var paren = 0;
            var lastFilterIndex = 0;
            var c,
            prev,
            i,
            expression,
            filters;

            for (i = 0; i < exp.length; i++) {
                prev = c;
                c = exp.charCodeAt(i);
                if (inSingle) {
                    if (c === 0x27 && prev !== 0x5C) {
                        inSingle = false;
                    }
                } else if (inDouble) {
                    if (c === 0x22 && prev !== 0x5C) {
                        inDouble = false;
                    }
                } else if (inTemplateString) {
                    if (c === 0x60 && prev !== 0x5C) {
                        inTemplateString = false;
                    }
                } else if (inRegex) {
                    if (c === 0x2f && prev !== 0x5C) {
                        inRegex = false;
                    }
                } else if (
                    c === 0x7C && // pipe
                    exp.charCodeAt(i + 1) !== 0x7C &&
                    exp.charCodeAt(i - 1) !== 0x7C &&
                    !curly && !square && !paren) {
                    if (expression === undefined) {
                        // first filter, end of expression
                        lastFilterIndex = i + 1;
                        expression = exp.slice(0, i).trim();
                    } else {
                        pushFilter();
                    }
                } else {
                    switch (c) {
                    case 0x22:
                        inDouble = true;
                        break // "
                    case 0x27:
                        inSingle = true;
                        break // '
                    case 0x60:
                        inTemplateString = true;
                        break // `
                    case 0x28:
                        paren++;
                        break // (
                    case 0x29:
                        paren--;
                        break // )
                    case 0x5B:
                        square++;
                        break // [
                    case 0x5D:
                        square--;
                        break // ]
                    case 0x7B:
                        curly++;
                        break // {
                    case 0x7D:
                        curly--;
                        break // }
                    }
                    if (c === 0x2f) { // /
                        var j = i - 1;
                        var p = (void 0);
                        // find first non-whitespace prev char
                        for (; j >= 0; j--) {
                            p = exp.charAt(j);
                            if (p !== ' ') {
                                break
                            }
                        }
                        if (!p || !validDivisionCharRE.test(p)) {
                            inRegex = true;
                        }
                    }
                }
            }

            if (expression === undefined) {
                expression = exp.slice(0, i).trim();
            } else if (lastFilterIndex !== 0) {
                pushFilter();
            }

            function pushFilter() {
                (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
                lastFilterIndex = i + 1;
            }

            if (filters) {
                for (i = 0; i < filters.length; i++) {
                    expression = wrapFilter(expression, filters[i]);
                }
            }

            return expression
        }

        function wrapFilter(exp, filter) {
            var i = filter.indexOf('(');
            if (i < 0) {
                // _f: resolveFilter
                return ("_f(\"" + filter + "\")(" + exp + ")")
            } else {
                var name = filter.slice(0, i);
                var args = filter.slice(i + 1);
                return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
            }
        }

        /*  */

        /* eslint-disable no-unused-vars */
        function baseWarn(msg, range) {
            console.error(("[Vue compiler]: " + msg));
        }
        /* eslint-enable no-unused-vars */

        function pluckModuleFunction(
            modules,
            key) {
            return modules
             ? modules.map(function (m) {
                return m[key];
            }).filter(function (_) {
                return _;
            })
             : []
        }

        function addProp(el, name, value, range, dynamic) {
            (el.props || (el.props = [])).push(rangeSetItem({
                    name: name,
                    value: value,
                    dynamic: dynamic
                }, range));
            el.plain = false;
        }

        function addAttr(el, name, value, range, dynamic) {
            var attrs = dynamic
                 ? (el.dynamicAttrs || (el.dynamicAttrs = []))
                 : (el.attrs || (el.attrs = []));
            attrs.push(rangeSetItem({
                    name: name,
                    value: value,
                    dynamic: dynamic
                }, range));
            el.plain = false;
        }

        // add a raw attr (use this in preTransforms)
        function addRawAttr(el, name, value, range) {
            el.attrsMap[name] = value;
            el.attrsList.push(rangeSetItem({
                    name: name,
                    value: value
                }, range));
        }

        function addDirective(
            el,
            name,
            rawName,
            value,
            arg,
            isDynamicArg,
            modifiers,
            range) {
            (el.directives || (el.directives = [])).push(rangeSetItem({
                    name: name,
                    rawName: rawName,
                    value: value,
                    arg: arg,
                    isDynamicArg: isDynamicArg,
                    modifiers: modifiers
                }, range));
            el.plain = false;
        }

        function prependModifierMarker(symbol, name, dynamic) {
            return dynamic
             ? ("_p(" + name + ",\"" + symbol + "\")")
             : symbol + name // mark the event as captured
        }

        function addHandler(
            el,
            name,
            value,
            modifiers,
            important,
            warn,
            range,
            dynamic) {
            modifiers = modifiers || emptyObject;
            // warn prevent and passive modifier
            /* istanbul ignore if */
            if (
                warn &&
                modifiers.prevent && modifiers.passive) {
                warn(
                    'passive and prevent can\'t be used together. ' +
                    'Passive handler can\'t prevent default event.',
                    range);
            }

            // normalize click.right and click.middle since they don't actually
			// fire
            // this is technically browser-specific, but at least for now
			// browsers are
            // the only target envs that have right/middle clicks.
            if (modifiers.right) {
                if (dynamic) {
                    name = "(" + name + ")==='click'?'contextmenu':(" + name + ")";
                } else if (name === 'click') {
                    name = 'contextmenu';
                    delete modifiers.right;
                }
            } else if (modifiers.middle) {
                if (dynamic) {
                    name = "(" + name + ")==='click'?'mouseup':(" + name + ")";
                } else if (name === 'click') {
                    name = 'mouseup';
                }
            }

            // check capture modifier
            if (modifiers.capture) {
                delete modifiers.capture;
                name = prependModifierMarker('!', name, dynamic);
            }
            if (modifiers.once) {
                delete modifiers.once;
                name = prependModifierMarker('~', name, dynamic);
            }
            /* istanbul ignore if */
            if (modifiers.passive) {
                delete modifiers.passive;
                name = prependModifierMarker('&', name, dynamic);
            }

            var events;
            if (modifiers.native) {
                delete modifiers.native;
                events = el.nativeEvents || (el.nativeEvents = {});
            } else {
                events = el.events || (el.events = {});
            }

            var newHandler = rangeSetItem({
                    value: value.trim(),
                    dynamic: dynamic
                }, range);
            if (modifiers !== emptyObject) {
                newHandler.modifiers = modifiers;
            }

            var handlers = events[name];
            /* istanbul ignore if */
            if (Array.isArray(handlers)) {
                important ? handlers.unshift(newHandler) : handlers.push(newHandler);
            } else if (handlers) {
                events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
            } else {
                events[name] = newHandler;
            }

            el.plain = false;
        }

        function getRawBindingAttr(
            el,
            name) {
            return el.rawAttrsMap[':' + name] ||
            el.rawAttrsMap['v-bind:' + name] ||
            el.rawAttrsMap[name]
        }

        function getBindingAttr(
            el,
            name,
            getStatic) {
            var dynamicValue =
                getAndRemoveAttr(el, ':' + name) ||
                getAndRemoveAttr(el, 'v-bind:' + name);
            if (dynamicValue != null) {
                return parseFilters(dynamicValue)
            } else if (getStatic !== false) {
                var staticValue = getAndRemoveAttr(el, name);
                if (staticValue != null) {
                    return JSON.stringify(staticValue)
                }
            }
        }

        // note: this only removes the attr from the Array (attrsList) so that
		// it
        // doesn't get processed by processAttrs.
        // By default it does NOT remove it from the map (attrsMap) because the
		// map
        // is
        // needed during codegen.
        function getAndRemoveAttr(
            el,
            name,
            removeFromMap) {
            var val;
            if ((val = el.attrsMap[name]) != null) {
                var list = el.attrsList;
                for (var i = 0, l = list.length; i < l; i++) {
                    if (list[i].name === name) {
                        list.splice(i, 1);
                        break
                    }
                }
            }
            if (removeFromMap) {
                delete el.attrsMap[name];
            }
            return val
        }

        function getAndRemoveAttrByRegex(
            el,
            name) {
            var list = el.attrsList;
            for (var i = 0, l = list.length; i < l; i++) {
                var attr = list[i];
                if (name.test(attr.name)) {
                    list.splice(i, 1);
                    return attr
                }
            }
        }

        function rangeSetItem(
            item,
            range) {
            if (range) {
                if (range.start != null) {
                    item.start = range.start;
                }
                if (range.end != null) {
                    item.end = range.end;
                }
            }
            return item
        }

        /*  */

        /**
		 * Cross-platform code generation for component v-model
		 */
        function genComponentModel(
            el,
            value,
            modifiers) {
            var ref = modifiers || {};
            var number = ref.number;
            var trim = ref.trim;

            var baseValueExpression = '$$v';
            var valueExpression = baseValueExpression;
            if (trim) {
                valueExpression =
                    "(typeof " + baseValueExpression + " === 'string'" +
                    "? " + baseValueExpression + ".trim()" +
                    ": " + baseValueExpression + ")";
            }
            if (number) {
                valueExpression = "_n(" + valueExpression + ")";
            }
            var assignment = genAssignmentCode(value, valueExpression);

            el.model = {
                value: ("(" + value + ")"),
                expression: JSON.stringify(value),
                callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
            };
        }

        /**
		 * Cross-platform codegen helper for generating v-model value assignment
		 * code.
		 */
        function genAssignmentCode(
            value,
            assignment) {
            var res = parseModel(value);
            if (res.key === null) {
                return (value + "=" + assignment)
            } else {
                return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
            }
        }

        /**
		 * Parse a v-model expression into a base path and a final key segment.
		 * Handles both dot-path and possible square brackets.
		 * 
		 * Possible cases: - test - test[key] - test[test1[key]] -
		 * test["a"][key] - xxx.test[a[a].test1[key]] -
		 * test.xxx.a["asa"][test1[key]]
		 * 
		 */

        var len,
        str,
        chr,
        index$1,
        expressionPos,
        expressionEndPos;

        function parseModel(val) {
            // Fix https://github.com/vuejs/vue/pull/7730
            // allow v-model="obj.val " (trailing whitespace)
            val = val.trim();
            len = val.length;

            if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
                index$1 = val.lastIndexOf('.');
                if (index$1 > -1) {
                    return {
                        exp: val.slice(0, index$1),
                        key: '"' + val.slice(index$1 + 1) + '"'
                    }
                } else {
                    return {
                        exp: val,
                        key: null
                    }
                }
            }

            str = val;
            index$1 = expressionPos = expressionEndPos = 0;
            while (!eof()) {
                chr = next();
                /* istanbul ignore if */
                if (isStringStart(chr)) {
                    parseString(chr);
                } else if (chr === 0x5B) {
                    parseBracket(chr);
                }
            }

            return {
                exp: val.slice(0, expressionPos),
                key: val.slice(expressionPos + 1, expressionEndPos)
            }
        }

        function next() {
            return str.charCodeAt(++index$1)
        }

        function eof() {
            return index$1 >= len
        }

        function isStringStart(chr) {
            return chr === 0x22 || chr === 0x27
        }

        function parseBracket(chr) {
            var inBracket = 1;
            expressionPos = index$1;
            while (!eof()) {
                chr = next();
                if (isStringStart(chr)) {
                    parseString(chr);
                    continue
                }
                if (chr === 0x5B) {
                    inBracket++;
                }
                if (chr === 0x5D) {
                    inBracket--;
                }
                if (inBracket === 0) {
                    expressionEndPos = index$1;
                    break
                }
            }
        }

        function parseString(chr) {
            var stringQuote = chr;
            while (!eof()) {
                chr = next();
                if (chr === stringQuote) {
                    break
                }
            }
        }

        /*  */

        var warn$1;

        // in some cases, the event used has to be determined at runtime
        // so we used some reserved tokens during compile.
        var RANGE_TOKEN = '__r';
        var CHECKBOX_RADIO_TOKEN = '__c';

        function model(
            el,
            dir,
            _warn) {
            warn$1 = _warn;
            var value = dir.value;
            var modifiers = dir.modifiers;
            var tag = el.tag;
            var type = el.attrsMap.type;
            {
                // inputs with type="file" are read only and setting the input's
                // value will throw an error.
                if (tag === 'input' && type === 'file') {
                    warn$1(
                        "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                        "File inputs are read only. Use a v-on:change listener instead.",
                        el.rawAttrsMap['v-model']);
                }
            }

            if (el.component) {
                genComponentModel(el, value, modifiers);
                // component v-model doesn't need extra runtime
                return false
            } else if (tag === 'select') {
                genSelect(el, value, modifiers);
            } else if (tag === 'input' && type === 'checkbox') {
                genCheckboxModel(el, value, modifiers);
            } else if (tag === 'input' && type === 'radio') {
                genRadioModel(el, value, modifiers);
            } else if (tag === 'input' || tag === 'textarea') {
                genDefaultModel(el, value, modifiers);
            } else if (!config.isReservedTag(tag)) {
                genComponentModel(el, value, modifiers);
                // component v-model doesn't need extra runtime
                return false
            } else {
                warn$1(
                    "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                    "v-model is not supported on this element type. " +
                    'If you are working with contenteditable, it\'s recommended to ' +
                    'wrap a library dedicated for that purpose inside a custom component.',
                    el.rawAttrsMap['v-model']);
            }

            // ensure runtime directive metadata
            return true
        }

        function genCheckboxModel(
            el,
            value,
            modifiers) {
            var number = modifiers && modifiers.number;
            var valueBinding = getBindingAttr(el, 'value') || 'null';
            var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
            var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
            addProp(el, 'checked',
                "Array.isArray(" + value + ")" +
                "?_i(" + value + "," + valueBinding + ")>-1" + (
                    trueValueBinding === 'true'
                     ? (":(" + value + ")")
                     : (":_q(" + value + "," + trueValueBinding + ")")));
            addHandler(el, 'change',
                "var $$a=" + value + "," +
                '$$el=$event.target,' +
                "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
                'if(Array.isArray($$a)){' +
                "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
                '$$i=_i($$a,$$v);' +
                "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
                "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
                "}else{" + (genAssignmentCode(value, '$$c')) + "}",
                null, true);
        }

        function genRadioModel(
            el,
            value,
            modifiers) {
            var number = modifiers && modifiers.number;
            var valueBinding = getBindingAttr(el, 'value') || 'null';
            valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
            addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
            addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
        }

        function genSelect(
            el,
            value,
            modifiers) {
            var number = modifiers && modifiers.number;
            var selectedVal = "Array.prototype.filter" +
                ".call($event.target.options,function(o){return o.selected})" +
                ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
                "return " + (number ? '_n(val)' : 'val') + "})";

            var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
            var code = "var $$selectedVal = " + selectedVal + ";";
            code = code + " " + (genAssignmentCode(value, assignment));
            addHandler(el, 'change', code, null, true);
        }

        function genDefaultModel(
            el,
            value,
            modifiers) {
            var type = el.attrsMap.type;

            // warn if v-bind:value conflicts with v-model
            // except for inputs with v-bind:type
            {
                var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
                var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
                if (value$1 && !typeBinding) {
                    var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
                    warn$1(
                        binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
                        'because the latter already expands to a value binding internally',
                        el.rawAttrsMap[binding]);
                }
            }

            var ref = modifiers || {};
            var lazy = ref.lazy;
            var number = ref.number;
            var trim = ref.trim;
            var needCompositionGuard = !lazy && type !== 'range';
            var event = lazy
                 ? 'change'
                 : type === 'range'
                 ? RANGE_TOKEN
                 : 'input';

            var valueExpression = '$event.target.value';
            if (trim) {
                valueExpression = "$event.target.value.trim()";
            }
            if (number) {
                valueExpression = "_n(" + valueExpression + ")";
            }

            var code = genAssignmentCode(value, valueExpression);
            if (needCompositionGuard) {
                code = "if($event.target.composing)return;" + code;
            }

            addProp(el, 'value', ("(" + value + ")"));
            addHandler(el, event, code, null, true);
            if (trim || number) {
                addHandler(el, 'blur', '$forceUpdate()');
            }
        }

        /*  */

        // normalize v-model event tokens that can only be determined at
		// runtime.
        // it's important to place the event as the first in the array because
        // the whole point is ensuring the v-model callback gets called before
        // user-attached handlers.
        function normalizeEvents(on) {
            /* istanbul ignore if */
            if (isDef(on[RANGE_TOKEN])) {
                // IE input[type=range] only supports `change` event
                var event = isIE ? 'change' : 'input';
                on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
                delete on[RANGE_TOKEN];
            }
            // This was originally intended to fix #4521 but no longer necessary
            // after 2.5. Keeping it for backwards compat with generated code
			// from < 2.4
            /* istanbul ignore if */
            if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
                on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
                delete on[CHECKBOX_RADIO_TOKEN];
            }
        }

        var target$1;

        function createOnceHandler$1(event, handler, capture) {
            var _target = target$1; // save current target element in closure
            return function onceHandler() {
                var res = handler.apply(null, arguments);
                if (res !== null) {
                    remove$2(event, onceHandler, capture, _target);
                }
            }
        }

        // #9446: Firefox <= 53 (in particular, ESR 52) has incorrect
        // Event.timeStamp
        // implementation and does not fire microtasks in between event
		// propagation,
        // so
        // safe to exclude.
        var useMicrotaskFix = isUsingMicroTask && !(isFF && Number(isFF[1]) <= 53);

        function add$1(
            name,
            handler,
            capture,
            passive) {
            // async edge case #6566: inner click event triggers patch, event
			// handler
            // attached to outer element during patch, and triggered again. This
            // happens because browsers fire microtask ticks between event
			// propagation.
            // the solution is simple: we save the timestamp when a handler is
			// attached,
            // and the handler would only fire if the event passed to it was
			// fired
            // AFTER it was attached.
            if (useMicrotaskFix) {
                var attachedTimestamp = currentFlushTimestamp;
                var original = handler;
                handler = original._wrapper = function (e) {
                    if (
                        // no bubbling, should always fire.
                        // this is just a safety net in case event.timeStamp is
						// unreliable
                        // in
                        // certain weird environments...
                        e.target === e.currentTarget ||
                        // event is fired after handler attachment
                        e.timeStamp >= attachedTimestamp ||
                        // bail for environments that have buggy event.timeStamp
                        // implementations
                        // #9462 iOS 9 bug: event.timeStamp is 0 after
						// history.pushState
                        // #9681 QtWebEngine event.timeStamp is negative value
                        e.timeStamp <= 0 ||
                        // #9448 bail if event is fired in another document in a
						// multi-page
                        // electron/nw.js app, since event.timeStamp will be
						// using a
                        // different
                        // starting reference
                        e.target.ownerDocument !== document) {
                        return original.apply(this, arguments)
                    }
                };
            }
            target$1.addEventListener(
                name,
                handler,
                supportsPassive
                 ? {
                capture: capture,
                passive: passive
            }
                 : capture);
        }

        function remove$2(
            name,
            handler,
            capture,
            _target) {
            (_target || target$1).removeEventListener(
                name,
                handler._wrapper || handler,
                capture);
        }

        function updateDOMListeners(oldVnode, vnode) {
            if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
                return
            }
            var on = vnode.data.on || {};
            var oldOn = oldVnode.data.on || {};
            target$1 = vnode.elm;
            normalizeEvents(on);
            updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);
            target$1 = undefined;
        }

        var events = {
            create: updateDOMListeners,
            update: updateDOMListeners
        };

        /*  */

        var svgContainer;

        function updateDOMProps(oldVnode, vnode) {
            if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
                return
            }
            var key,
            cur;
            var elm = vnode.elm;
            var oldProps = oldVnode.data.domProps || {};
            var props = vnode.data.domProps || {};
            // clone observed objects, as the user probably wants to mutate it
            if (isDef(props.__ob__)) {
                props = vnode.data.domProps = extend({}, props);
            }

            for (key in oldProps) {
                if (!(key in props)) {
                    elm[key] = '';
                }
            }

            for (key in props) {
                cur = props[key];
                // ignore children if the node has textContent or innerHTML,
                // as these will throw away existing DOM nodes and cause removal
				// errors
                // on subsequent patches (#3360)
                if (key === 'textContent' || key === 'innerHTML') {
                    if (vnode.children) {
                        vnode.children.length = 0;
                    }
                    if (cur === oldProps[key]) {
                        continue
                    }
                    // #6601 work around Chrome version <= 55 bug where single
					// textNode
                    // replaced by innerHTML/textContent retains its parentNode
					// property
                    if (elm.childNodes.length === 1) {
                        elm.removeChild(elm.childNodes[0]);
                    }
                }

                if (key === 'value' && elm.tagName !== 'PROGRESS') {
                    // store value as _value as well since
                    // non-string values will be stringified
                    elm._value = cur;
                    // avoid resetting cursor position when value is the same
                    var strCur = isUndef(cur) ? '' : String(cur);
                    if (shouldUpdateValue(elm, strCur)) {
                        elm.value = strCur;
                    }
                } else if (key === 'innerHTML' && isSVG(elm.tagName) && isUndef(elm.innerHTML)) {
                    // IE doesn't support innerHTML for SVG elements
                    svgContainer = svgContainer || document.createElement('div');
                    svgContainer.innerHTML = "<svg>" + cur + "</svg>";
                    var svg = svgContainer.firstChild;
                    while (elm.firstChild) {
                        elm.removeChild(elm.firstChild);
                    }
                    while (svg.firstChild) {
                        elm.appendChild(svg.firstChild);
                    }
                } else if (
                    // skip the update if old and new VDOM state is the same.
                    // `value` is handled separately because the DOM value may
					// be
                    // temporarily
                    // out of sync with VDOM state due to focus, composition and
					// modifiers.
                    // This #4521 by skipping the unnecessary `checked` update.
                    cur !== oldProps[key]) {
                    // some property updates can throw
                    // e.g. `value` on <progress> w/ non-finite value
                    try {
                        elm[key] = cur;
                    } catch (e) {}
                }
            }
        }

        // check platforms/web/util/attrs.js acceptValue


        function shouldUpdateValue(elm, checkVal) {
            return (!elm.composing && (
                    elm.tagName === 'OPTION' ||
                    isNotInFocusAndDirty(elm, checkVal) ||
                    isDirtyWithModifiers(elm, checkVal)))
        }

        function isNotInFocusAndDirty(elm, checkVal) {
            // return true when textbox (.number and .trim) loses focus and its
			// value is
            // not equal to the updated value
            var notInFocus = true;
            // #6157
            // work around IE bug when accessing document.activeElement in an
			// iframe
            try {
                notInFocus = document.activeElement !== elm;
            } catch (e) {}
            return notInFocus && elm.value !== checkVal
        }

        function isDirtyWithModifiers(elm, newVal) {
            var value = elm.value;
            var modifiers = elm._vModifiers; // injected by v-model runtime
            if (isDef(modifiers)) {
                if (modifiers.number) {
                    return toNumber(value) !== toNumber(newVal)
                }
                if (modifiers.trim) {
                    return value.trim() !== newVal.trim()
                }
            }
            return value !== newVal
        }

        var domProps = {
            create: updateDOMProps,
            update: updateDOMProps
        };

        /*  */

        var parseStyleText = cached(function (cssText) {
                var res = {};
                var listDelimiter = /;(?![^(]*\))/g;
                var propertyDelimiter = /:(.+)/;
                cssText.split(listDelimiter).forEach(function (item) {
                    if (item) {
                        var tmp = item.split(propertyDelimiter);
                        tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
                    }
                });
                return res
            });

        // merge static and dynamic style data on the same vnode
        function normalizeStyleData(data) {
            var style = normalizeStyleBinding(data.style);
            // static style is pre-processed into an object during compilation
            // and is always a fresh object, so it's safe to merge into it
            return data.staticStyle
             ? extend(data.staticStyle, style)
             : style
        }

        // normalize possible array / string values into Object
        function normalizeStyleBinding(bindingStyle) {
            if (Array.isArray(bindingStyle)) {
                return toObject(bindingStyle)
            }
            if (typeof bindingStyle === 'string') {
                return parseStyleText(bindingStyle)
            }
            return bindingStyle
        }

        /**
		 * parent component style should be after child's so that parent
		 * component's style could override it
		 */
        function getStyle(vnode, checkChild) {
            var res = {};
            var styleData;

            if (checkChild) {
                var childNode = vnode;
                while (childNode.componentInstance) {
                    childNode = childNode.componentInstance._vnode;
                    if (
                        childNode && childNode.data &&
                        (styleData = normalizeStyleData(childNode.data))) {
                        extend(res, styleData);
                    }
                }
            }

            if ((styleData = normalizeStyleData(vnode.data))) {
                extend(res, styleData);
            }

            var parentNode = vnode;
            while ((parentNode = parentNode.parent)) {
                if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
                    extend(res, styleData);
                }
            }
            return res
        }

        /*  */

        var cssVarRE = /^--/;
        var importantRE = /\s*!important$/;
        var setProp = function (el, name, val) {
            /* istanbul ignore if */
            if (cssVarRE.test(name)) {
                el.style.setProperty(name, val);
            } else if (importantRE.test(val)) {
                el.style.setProperty(hyphenate(name), val.replace(importantRE, ''), 'important');
            } else {
                var normalizedName = normalize(name);
                if (Array.isArray(val)) {
                    // Support values array created by autoprefixer, e.g.
                    // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
                    // Set them one by one, and the browser will only set those
					// it can
                    // recognize
                    for (var i = 0, len = val.length; i < len; i++) {
                        el.style[normalizedName] = val[i];
                    }
                } else {
                    el.style[normalizedName] = val;
                }
            }
        };

        var vendorNames = ['Webkit', 'Moz', 'ms'];

        var emptyStyle;
        var normalize = cached(function (prop) {
                emptyStyle = emptyStyle || document.createElement('div').style;
                prop = camelize(prop);
                if (prop !== 'filter' && (prop in emptyStyle)) {
                    return prop
                }
                var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
                for (var i = 0; i < vendorNames.length; i++) {
                    var name = vendorNames[i] + capName;
                    if (name in emptyStyle) {
                        return name
                    }
                }
            });

        function updateStyle(oldVnode, vnode) {
            var data = vnode.data;
            var oldData = oldVnode.data;

            if (isUndef(data.staticStyle) && isUndef(data.style) &&
                isUndef(oldData.staticStyle) && isUndef(oldData.style)) {
                return
            }

            var cur,
            name;
            var el = vnode.elm;
            var oldStaticStyle = oldData.staticStyle;
            var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};

            // if static style exists, stylebinding already merged into it when
			// doing
            // normalizeStyleData
            var oldStyle = oldStaticStyle || oldStyleBinding;

            var style = normalizeStyleBinding(vnode.data.style) || {};

            // store normalized style under a different key for next diff
            // make sure to clone it if it's reactive, since the user likely
			// wants
            // to mutate it.
            vnode.data.normalizedStyle = isDef(style.__ob__)
                 ? extend({}, style)
                 : style;

            var newStyle = getStyle(vnode, true);

            for (name in oldStyle) {
                if (isUndef(newStyle[name])) {
                    setProp(el, name, '');
                }
            }
            for (name in newStyle) {
                cur = newStyle[name];
                if (cur !== oldStyle[name]) {
                    // ie9 setting to null has no effect, must use empty string
                    setProp(el, name, cur == null ? '' : cur);
                }
            }
        }

        var style = {
            create: updateStyle,
            update: updateStyle
        };

        /*  */

        var whitespaceRE = /\s+/;

        /**
		 * Add class with compatibility for SVG since classList is not supported
		 * on SVG elements in IE
		 */
        function addClass(el, cls) {
            /* istanbul ignore if */
            if (!cls || !(cls = cls.trim())) {
                return
            }

            /* istanbul ignore else */
            if (el.classList) {
                if (cls.indexOf(' ') > -1) {
                    cls.split(whitespaceRE).forEach(function (c) {
                        return el.classList.add(c);
                    });
                } else {
                    el.classList.add(cls);
                }
            } else {
                var cur = " " + (el.getAttribute('class') || '') + " ";
                if (cur.indexOf(' ' + cls + ' ') < 0) {
                    el.setAttribute('class', (cur + cls).trim());
                }
            }
        }

        /**
		 * Remove class with compatibility for SVG since classList is not
		 * supported on SVG elements in IE
		 */
        function removeClass(el, cls) {
            /* istanbul ignore if */
            if (!cls || !(cls = cls.trim())) {
                return
            }

            /* istanbul ignore else */
            if (el.classList) {
                if (cls.indexOf(' ') > -1) {
                    cls.split(whitespaceRE).forEach(function (c) {
                        return el.classList.remove(c);
                    });
                } else {
                    el.classList.remove(cls);
                }
                if (!el.classList.length) {
                    el.removeAttribute('class');
                }
            } else {
                var cur = " " + (el.getAttribute('class') || '') + " ";
                var tar = ' ' + cls + ' ';
                while (cur.indexOf(tar) >= 0) {
                    cur = cur.replace(tar, ' ');
                }
                cur = cur.trim();
                if (cur) {
                    el.setAttribute('class', cur);
                } else {
                    el.removeAttribute('class');
                }
            }
        }

        /*  */

        function resolveTransition(def$$1) {
            if (!def$$1) {
                return
            }
            /* istanbul ignore else */
            if (typeof def$$1 === 'object') {
                var res = {};
                if (def$$1.css !== false) {
                    extend(res, autoCssTransition(def$$1.name || 'v'));
                }
                extend(res, def$$1);
                return res
            } else if (typeof def$$1 === 'string') {
                return autoCssTransition(def$$1)
            }
        }

        var autoCssTransition = cached(function (name) {
                return {
                    enterClass: (name + "-enter"),
                    enterToClass: (name + "-enter-to"),
                    enterActiveClass: (name + "-enter-active"),
                    leaveClass: (name + "-leave"),
                    leaveToClass: (name + "-leave-to"),
                    leaveActiveClass: (name + "-leave-active")
                }
            });

        var hasTransition = inBrowser && !isIE9;
        var TRANSITION = 'transition';
        var ANIMATION = 'animation';

        // Transition property/event sniffing
        var transitionProp = 'transition';
        var transitionEndEvent = 'transitionend';
        var animationProp = 'animation';
        var animationEndEvent = 'animationend';
        if (hasTransition) {
            /* istanbul ignore if */
            if (window.ontransitionend === undefined &&
                window.onwebkittransitionend !== undefined) {
                transitionProp = 'WebkitTransition';
                transitionEndEvent = 'webkitTransitionEnd';
            }
            if (window.onanimationend === undefined &&
                window.onwebkitanimationend !== undefined) {
                animationProp = 'WebkitAnimation';
                animationEndEvent = 'webkitAnimationEnd';
            }
        }

        // binding to window is necessary to make hot reload work in IE in
		// strict
        // mode
        var raf = inBrowser
             ? window.requestAnimationFrame
             ? window.requestAnimationFrame.bind(window)
             : setTimeout
             : /* istanbul ignore next */ function (fn) {
            return fn();
        };

        function nextFrame(fn) {
            raf(function () {
                raf(fn);
            });
        }

        function addTransitionClass(el, cls) {
            var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
            if (transitionClasses.indexOf(cls) < 0) {
                transitionClasses.push(cls);
                addClass(el, cls);
            }
        }

        function removeTransitionClass(el, cls) {
            if (el._transitionClasses) {
                remove(el._transitionClasses, cls);
            }
            removeClass(el, cls);
        }

        function whenTransitionEnds(
            el,
            expectedType,
            cb) {
            var ref = getTransitionInfo(el, expectedType);
            var type = ref.type;
            var timeout = ref.timeout;
            var propCount = ref.propCount;
            if (!type) {
                return cb()
            }
            var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
            var ended = 0;
            var end = function () {
                el.removeEventListener(event, onEnd);
                cb();
            };
            var onEnd = function (e) {
                if (e.target === el) {
                    if (++ended >= propCount) {
                        end();
                    }
                }
            };
            setTimeout(function () {
                if (ended < propCount) {
                    end();
                }
            }, timeout + 1);
            el.addEventListener(event, onEnd);
        }

        var transformRE = /\b(transform|all)(,|$)/;

        function getTransitionInfo(el, expectedType) {
            var styles = window.getComputedStyle(el);
            // JSDOM may return undefined for transition properties
            var transitionDelays = (styles[transitionProp + 'Delay'] || '').split(', ');
            var transitionDurations = (styles[transitionProp + 'Duration'] || '').split(', ');
            var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
            var animationDelays = (styles[animationProp + 'Delay'] || '').split(', ');
            var animationDurations = (styles[animationProp + 'Duration'] || '').split(', ');
            var animationTimeout = getTimeout(animationDelays, animationDurations);

            var type;
            var timeout = 0;
            var propCount = 0;
            /* istanbul ignore if */
            if (expectedType === TRANSITION) {
                if (transitionTimeout > 0) {
                    type = TRANSITION;
                    timeout = transitionTimeout;
                    propCount = transitionDurations.length;
                }
            } else if (expectedType === ANIMATION) {
                if (animationTimeout > 0) {
                    type = ANIMATION;
                    timeout = animationTimeout;
                    propCount = animationDurations.length;
                }
            } else {
                timeout = Math.max(transitionTimeout, animationTimeout);
                type = timeout > 0
                     ? transitionTimeout > animationTimeout
                     ? TRANSITION
                     : ANIMATION
                     : null;
                propCount = type
                     ? type === TRANSITION
                     ? transitionDurations.length
                     : animationDurations.length
                     : 0;
            }
            var hasTransform =
                type === TRANSITION &&
                transformRE.test(styles[transitionProp + 'Property']);
            return {
                type: type,
                timeout: timeout,
                propCount: propCount,
                hasTransform: hasTransform
            }
        }

        function getTimeout(delays, durations) {
            /* istanbul ignore next */
            while (delays.length < durations.length) {
                delays = delays.concat(delays);
            }

            return Math.max.apply(null, durations.map(function (d, i) {
                    return toMs(d) + toMs(delays[i])
                }))
        }

        // Old versions of Chromium (below 61.0.3163.100) formats floating
		// pointer
        // numbers
        // in a locale-dependent way, using a comma instead of a dot.
        // If comma is not replaced with a dot, the input will be rounded down
		// (i.e.
        // acting
        // as a floor function) causing unexpected behaviors
        function toMs(s) {
            return Number(s.slice(0, -1).replace(',', '.')) * 1000
        }

        /*  */

        function enter(vnode, toggleDisplay) {
            var el = vnode.elm;

            // call leave callback now
            if (isDef(el._leaveCb)) {
                el._leaveCb.cancelled = true;
                el._leaveCb();
            }

            var data = resolveTransition(vnode.data.transition);
            if (isUndef(data)) {
                return
            }

            /* istanbul ignore if */
            if (isDef(el._enterCb) || el.nodeType !== 1) {
                return
            }

            var css = data.css;
            var type = data.type;
            var enterClass = data.enterClass;
            var enterToClass = data.enterToClass;
            var enterActiveClass = data.enterActiveClass;
            var appearClass = data.appearClass;
            var appearToClass = data.appearToClass;
            var appearActiveClass = data.appearActiveClass;
            var beforeEnter = data.beforeEnter;
            var enter = data.enter;
            var afterEnter = data.afterEnter;
            var enterCancelled = data.enterCancelled;
            var beforeAppear = data.beforeAppear;
            var appear = data.appear;
            var afterAppear = data.afterAppear;
            var appearCancelled = data.appearCancelled;
            var duration = data.duration;

            // activeInstance will always be the <transition> component managing
			// this
            // transition. One edge case to check is when the <transition> is
			// placed
            // as the root node of a child component. In that case we need to
			// check
            // <transition>'s parent for appear check.
            var context = activeInstance;
            var transitionNode = activeInstance.$vnode;
            while (transitionNode && transitionNode.parent) {
                context = transitionNode.context;
                transitionNode = transitionNode.parent;
            }

            var isAppear = !context._isMounted || !vnode.isRootInsert;

            if (isAppear && !appear && appear !== '') {
                return
            }

            var startClass = isAppear && appearClass
                 ? appearClass
                 : enterClass;
            var activeClass = isAppear && appearActiveClass
                 ? appearActiveClass
                 : enterActiveClass;
            var toClass = isAppear && appearToClass
                 ? appearToClass
                 : enterToClass;

            var beforeEnterHook = isAppear
                 ? (beforeAppear || beforeEnter)
                 : beforeEnter;
            var enterHook = isAppear
                 ? (typeof appear === 'function' ? appear : enter)
                 : enter;
            var afterEnterHook = isAppear
                 ? (afterAppear || afterEnter)
                 : afterEnter;
            var enterCancelledHook = isAppear
                 ? (appearCancelled || enterCancelled)
                 : enterCancelled;

            var explicitEnterDuration = toNumber(
                    isObject(duration)
                     ? duration.enter
                     : duration);

            if (explicitEnterDuration != null) {
                checkDuration(explicitEnterDuration, 'enter', vnode);
            }

            var expectsCSS = css !== false && !isIE9;
            var userWantsControl = getHookArgumentsLength(enterHook);

            var cb = el._enterCb = once(function () {
                    if (expectsCSS) {
                        removeTransitionClass(el, toClass);
                        removeTransitionClass(el, activeClass);
                    }
                    if (cb.cancelled) {
                        if (expectsCSS) {
                            removeTransitionClass(el, startClass);
                        }
                        enterCancelledHook && enterCancelledHook(el);
                    } else {
                        afterEnterHook && afterEnterHook(el);
                    }
                    el._enterCb = null;
                });

            if (!vnode.data.show) {
                // remove pending leave element on enter by injecting an insert
				// hook
                mergeVNodeHook(vnode, 'insert', function () {
                    var parent = el.parentNode;
                    var pendingNode = parent && parent._pending && parent._pending[vnode.key];
                    if (pendingNode &&
                        pendingNode.tag === vnode.tag &&
                        pendingNode.elm._leaveCb) {
                        pendingNode.elm._leaveCb();
                    }
                    enterHook && enterHook(el, cb);
                });
            }

            // start enter transition
            beforeEnterHook && beforeEnterHook(el);
            if (expectsCSS) {
                addTransitionClass(el, startClass);
                addTransitionClass(el, activeClass);
                nextFrame(function () {
                    removeTransitionClass(el, startClass);
                    if (!cb.cancelled) {
                        addTransitionClass(el, toClass);
                        if (!userWantsControl) {
                            if (isValidDuration(explicitEnterDuration)) {
                                setTimeout(cb, explicitEnterDuration);
                            } else {
                                whenTransitionEnds(el, type, cb);
                            }
                        }
                    }
                });
            }

            if (vnode.data.show) {
                toggleDisplay && toggleDisplay();
                enterHook && enterHook(el, cb);
            }

            if (!expectsCSS && !userWantsControl) {
                cb();
            }
        }

        function leave(vnode, rm) {
            var el = vnode.elm;

            // call enter callback now
            if (isDef(el._enterCb)) {
                el._enterCb.cancelled = true;
                el._enterCb();
            }

            var data = resolveTransition(vnode.data.transition);
            if (isUndef(data) || el.nodeType !== 1) {
                return rm()
            }

            /* istanbul ignore if */
            if (isDef(el._leaveCb)) {
                return
            }

            var css = data.css;
            var type = data.type;
            var leaveClass = data.leaveClass;
            var leaveToClass = data.leaveToClass;
            var leaveActiveClass = data.leaveActiveClass;
            var beforeLeave = data.beforeLeave;
            var leave = data.leave;
            var afterLeave = data.afterLeave;
            var leaveCancelled = data.leaveCancelled;
            var delayLeave = data.delayLeave;
            var duration = data.duration;

            var expectsCSS = css !== false && !isIE9;
            var userWantsControl = getHookArgumentsLength(leave);

            var explicitLeaveDuration = toNumber(
                    isObject(duration)
                     ? duration.leave
                     : duration);

            if (isDef(explicitLeaveDuration)) {
                checkDuration(explicitLeaveDuration, 'leave', vnode);
            }

            var cb = el._leaveCb = once(function () {
                    if (el.parentNode && el.parentNode._pending) {
                        el.parentNode._pending[vnode.key] = null;
                    }
                    if (expectsCSS) {
                        removeTransitionClass(el, leaveToClass);
                        removeTransitionClass(el, leaveActiveClass);
                    }
                    if (cb.cancelled) {
                        if (expectsCSS) {
                            removeTransitionClass(el, leaveClass);
                        }
                        leaveCancelled && leaveCancelled(el);
                    } else {
                        rm();
                        afterLeave && afterLeave(el);
                    }
                    el._leaveCb = null;
                });

            if (delayLeave) {
                delayLeave(performLeave);
            } else {
                performLeave();
            }

            function performLeave() {
                // the delayed leave may have already been cancelled
                if (cb.cancelled) {
                    return
                }
                // record leaving element
                if (!vnode.data.show && el.parentNode) {
                    (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
                }
                beforeLeave && beforeLeave(el);
                if (expectsCSS) {
                    addTransitionClass(el, leaveClass);
                    addTransitionClass(el, leaveActiveClass);
                    nextFrame(function () {
                        removeTransitionClass(el, leaveClass);
                        if (!cb.cancelled) {
                            addTransitionClass(el, leaveToClass);
                            if (!userWantsControl) {
                                if (isValidDuration(explicitLeaveDuration)) {
                                    setTimeout(cb, explicitLeaveDuration);
                                } else {
                                    whenTransitionEnds(el, type, cb);
                                }
                            }
                        }
                    });
                }
                leave && leave(el, cb);
                if (!expectsCSS && !userWantsControl) {
                    cb();
                }
            }
        }

        // only used in dev mode
        function checkDuration(val, name, vnode) {
            if (typeof val !== 'number') {
                warn(
                    "<transition> explicit " + name + " duration is not a valid number - " +
                    "got " + (JSON.stringify(val)) + ".",
                    vnode.context);
            } else if (isNaN(val)) {
                warn(
                    "<transition> explicit " + name + " duration is NaN - " +
                    'the duration expression might be incorrect.',
                    vnode.context);
            }
        }

        function isValidDuration(val) {
            return typeof val === 'number' && !isNaN(val)
        }

        /**
		 * Normalize a transition hook's argument length. The hook may be: - a
		 * merged hook (invoker) with the original in .fns - a wrapped component
		 * method (check ._length) - a plain function (.length)
		 */
        function getHookArgumentsLength(fn) {
            if (isUndef(fn)) {
                return false
            }
            var invokerFns = fn.fns;
            if (isDef(invokerFns)) {
                // invoker
                return getHookArgumentsLength(
                    Array.isArray(invokerFns)
                     ? invokerFns[0]
                     : invokerFns)
            } else {
                return (fn._length || fn.length) > 1
            }
        }

        function _enter(_, vnode) {
            if (vnode.data.show !== true) {
                enter(vnode);
            }
        }

        var transition = inBrowser ? {
            create: _enter,
            activate: _enter,
            remove: function remove$$1(vnode, rm) {
                /* istanbul ignore else */
                if (vnode.data.show !== true) {
                    leave(vnode, rm);
                } else {
                    rm();
                }
            }
        }
         : {};

        var platformModules = [
            attrs,
            klass,
            events,
            domProps,
            style,
            transition
        ];

        /*  */

        // the directive module should be applied last, after all
        // built-in modules have been applied.
        var modules = platformModules.concat(baseModules);

        var patch = createPatchFunction({
                nodeOps: nodeOps,
                modules: modules
            });

        /**
		 * Not type checking this file because flow doesn't like attaching
		 * properties to Elements.
		 */

        /* istanbul ignore if */
        if (isIE9) {
            // http://www.matts411.com/post/internet-explorer-9-oninput/
            document.addEventListener('selectionchange', function () {
                var el = document.activeElement;
                if (el && el.vmodel) {
                    trigger(el, 'input');
                }
            });
        }

        var directive = {
            inserted: function inserted(el, binding, vnode, oldVnode) {
                if (vnode.tag === 'select') {
                    // #6903
                    if (oldVnode.elm && !oldVnode.elm._vOptions) {
                        mergeVNodeHook(vnode, 'postpatch', function () {
                            directive.componentUpdated(el, binding, vnode);
                        });
                    } else {
                        setSelected(el, binding, vnode.context);
                    }
                    el._vOptions = [].map.call(el.options, getValue);
                } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
                    el._vModifiers = binding.modifiers;
                    if (!binding.modifiers.lazy) {
                        el.addEventListener('compositionstart', onCompositionStart);
                        el.addEventListener('compositionend', onCompositionEnd);
                        // Safari < 10.2 & UIWebView doesn't fire compositionend
						// when
                        // switching focus before confirming composition choice
                        // this also fixes the issue where some browsers e.g.
						// iOS Chrome
                        // fires "change" instead of "input" on autocomplete.
                        el.addEventListener('change', onCompositionEnd);
                        /* istanbul ignore if */
                        if (isIE9) {
                            el.vmodel = true;
                        }
                    }
                }
            },

            componentUpdated: function componentUpdated(el, binding, vnode) {
                if (vnode.tag === 'select') {
                    setSelected(el, binding, vnode.context);
                    // in case the options rendered by v-for have changed,
                    // it's possible that the value is out-of-sync with the
					// rendered
                    // options.
                    // detect such cases and filter out values that no longer
					// has a matching
                    // option in the DOM.
                    var prevOptions = el._vOptions;
                    var curOptions = el._vOptions = [].map.call(el.options, getValue);
                    if (curOptions.some(function (o, i) {
                            return !looseEqual(o, prevOptions[i]);
                        })) {
                        // trigger change event if
                        // no matching option found for at least one value
                        var needReset = el.multiple
                             ? binding.value.some(function (v) {
                                return hasNoMatchingOption(v, curOptions);
                            })
                             : binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
                        if (needReset) {
                            trigger(el, 'change');
                        }
                    }
                }
            }
        };

        function setSelected(el, binding, vm) {
            actuallySetSelected(el, binding, vm);
            /* istanbul ignore if */
            if (isIE || isEdge) {
                setTimeout(function () {
                    actuallySetSelected(el, binding, vm);
                }, 0);
            }
        }

        function actuallySetSelected(el, binding, vm) {
            var value = binding.value;
            var isMultiple = el.multiple;
            if (isMultiple && !Array.isArray(value)) {
                warn(
                    "<select multiple v-model=\"" + (binding.expression) + "\"> " +
                    "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
                    vm);
                return
            }
            var selected,
            option;
            for (var i = 0, l = el.options.length; i < l; i++) {
                option = el.options[i];
                if (isMultiple) {
                    selected = looseIndexOf(value, getValue(option)) > -1;
                    if (option.selected !== selected) {
                        option.selected = selected;
                    }
                } else {
                    if (looseEqual(getValue(option), value)) {
                        if (el.selectedIndex !== i) {
                            el.selectedIndex = i;
                        }
                        return
                    }
                }
            }
            if (!isMultiple) {
                el.selectedIndex = -1;
            }
        }

        function hasNoMatchingOption(value, options) {
            return options.every(function (o) {
                return !looseEqual(o, value);
            })
        }

        function getValue(option) {
            return '_value' in option
             ? option._value
             : option.value
        }

        function onCompositionStart(e) {
            e.target.composing = true;
        }

        function onCompositionEnd(e) {
            // prevent triggering an input event for no reason
            if (!e.target.composing) {
                return
            }
            e.target.composing = false;
            trigger(e.target, 'input');
        }

        function trigger(el, type) {
            var e = document.createEvent('HTMLEvents');
            e.initEvent(type, true, true);
            el.dispatchEvent(e);
        }

        /*  */

        // recursively search for possible transition defined inside the
		// component
        // root
        function locateNode(vnode) {
            return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
             ? locateNode(vnode.componentInstance._vnode)
             : vnode
        }

        var show = {
            bind: function bind(el, ref, vnode) {
                var value = ref.value;

                vnode = locateNode(vnode);
                var transition$$1 = vnode.data && vnode.data.transition;
                var originalDisplay = el.__vOriginalDisplay =
                    el.style.display === 'none' ? '' : el.style.display;
                if (value && transition$$1) {
                    vnode.data.show = true;
                    enter(vnode, function () {
                        el.style.display = originalDisplay;
                    });
                } else {
                    el.style.display = value ? originalDisplay : 'none';
                }
            },

            update: function update(el, ref, vnode) {
                var value = ref.value;
                var oldValue = ref.oldValue;

                /* istanbul ignore if */
                if (!value === !oldValue) {
                    return
                }
                vnode = locateNode(vnode);
                var transition$$1 = vnode.data && vnode.data.transition;
                if (transition$$1) {
                    vnode.data.show = true;
                    if (value) {
                        enter(vnode, function () {
                            el.style.display = el.__vOriginalDisplay;
                        });
                    } else {
                        leave(vnode, function () {
                            el.style.display = 'none';
                        });
                    }
                } else {
                    el.style.display = value ? el.__vOriginalDisplay : 'none';
                }
            },

            unbind: function unbind(
                el,
                binding,
                vnode,
                oldVnode,
                isDestroy) {
                if (!isDestroy) {
                    el.style.display = el.__vOriginalDisplay;
                }
            }
        };

        var platformDirectives = {
            model: directive,
            show: show
        };

        /*  */

        var transitionProps = {
            name: String,
            appear: Boolean,
            css: Boolean,
            mode: String,
            type: String,
            enterClass: String,
            leaveClass: String,
            enterToClass: String,
            leaveToClass: String,
            enterActiveClass: String,
            leaveActiveClass: String,
            appearClass: String,
            appearActiveClass: String,
            appearToClass: String,
            duration: [Number, String, Object]
        };

        // in case the child is also an abstract component, e.g. <keep-alive>
        // we want to recursively retrieve the real component to be rendered
        function getRealChild(vnode) {
            var compOptions = vnode && vnode.componentOptions;
            if (compOptions && compOptions.Ctor.options.abstract) {
                return getRealChild(getFirstComponentChild(compOptions.children))
            } else {
                return vnode
            }
        }

        function extractTransitionData(comp) {
            var data = {};
            var options = comp.$options;
            // props
            for (var key in options.propsData) {
                data[key] = comp[key];
            }
            // events.
            // extract listeners and pass them directly to the transition
			// methods
            var listeners = options._parentListeners;
            for (var key$1 in listeners) {
                data[camelize(key$1)] = listeners[key$1];
            }
            return data
        }

        function placeholder(h, rawChild) {
            if (/\d-keep-alive$/.test(rawChild.tag)) {
                return h('keep-alive', {
                    props: rawChild.componentOptions.propsData
                })
            }
        }

        function hasParentTransition(vnode) {
            while ((vnode = vnode.parent)) {
                if (vnode.data.transition) {
                    return true
                }
            }
        }

        function isSameChild(child, oldChild) {
            return oldChild.key === child.key && oldChild.tag === child.tag
        }

        var isNotTextNode = function (c) {
            return c.tag || isAsyncPlaceholder(c);
        };

        var isVShowDirective = function (d) {
            return d.name === 'show';
        };

        var Transition = {
            name: 'transition',
            props: transitionProps,
            abstract: true,

            render: function render(h) {
                var this$1 = this;

                var children = this.$slots.default;
                if (!children) {
                    return
                }

                // filter out text nodes (possible whitespaces)
                children = children.filter(isNotTextNode);
                /* istanbul ignore if */
                if (!children.length) {
                    return
                }

                // warn multiple elements
                if (children.length > 1) {
                    warn(
                        '<transition> can only be used on a single element. Use ' +
                        '<transition-group> for lists.',
                        this.$parent);
                }

                var mode = this.mode;

                // warn invalid mode
                if (mode && mode !== 'in-out' && mode !== 'out-in') {
                    warn(
                        'invalid <transition> mode: ' + mode,
                        this.$parent);
                }

                var rawChild = children[0];

                // if this is a component root node and the component's
                // parent container node also has transition, skip.
                if (hasParentTransition(this.$vnode)) {
                    return rawChild
                }

                // apply transition data to child
                // use getRealChild() to ignore abstract components e.g.
				// keep-alive
                var child = getRealChild(rawChild);
                /* istanbul ignore if */
                if (!child) {
                    return rawChild
                }

                if (this._leaving) {
                    return placeholder(h, rawChild)
                }

                // ensure a key that is unique to the vnode type and to this
				// transition
                // component instance. This key will be used to remove pending
				// leaving
                // nodes
                // during entering.
                var id = "__transition-" + (this._uid) + "-";
                child.key = child.key == null
                     ? child.isComment
                     ? id + 'comment'
                     : id + child.tag
                     : isPrimitive(child.key)
                     ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
                     : child.key;

                var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
                var oldRawChild = this._vnode;
                var oldChild = getRealChild(oldRawChild);

                // mark v-show
                // so that the transition module can hand over the control to
				// the
                // directive
                if (child.data.directives && child.data.directives.some(isVShowDirective)) {
                    child.data.show = true;
                }

                if (
                    oldChild &&
                    oldChild.data &&
                    !isSameChild(child, oldChild) &&
                    !isAsyncPlaceholder(oldChild) &&
                    // #6687 component root is a comment node
                    !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)) {
                    // replace old child transition data with fresh one
                    // important for dynamic transitions!
                    var oldData = oldChild.data.transition = extend({}, data);
                    // handle transition mode
                    if (mode === 'out-in') {
                        // return placeholder node and queue update when leave
						// finishes
                        this._leaving = true;
                        mergeVNodeHook(oldData, 'afterLeave', function () {
                            this$1._leaving = false;
                            this$1.$forceUpdate();
                        });
                        return placeholder(h, rawChild)
                    } else if (mode === 'in-out') {
                        if (isAsyncPlaceholder(child)) {
                            return oldRawChild
                        }
                        var delayedLeave;
                        var performLeave = function () {
                            delayedLeave();
                        };
                        mergeVNodeHook(data, 'afterEnter', performLeave);
                        mergeVNodeHook(data, 'enterCancelled', performLeave);
                        mergeVNodeHook(oldData, 'delayLeave', function (leave) {
                            delayedLeave = leave;
                        });
                    }
                }

                return rawChild
            }
        };

        /*  */

        var props = extend({
                tag: String,
                moveClass: String
            }, transitionProps);

        delete props.mode;

        var TransitionGroup = {
            props: props,

            beforeMount: function beforeMount() {
                var this$1 = this;

                var update = this._update;
                this._update = function (vnode, hydrating) {
                    var restoreActiveInstance = setActiveInstance(this$1);
                    // force removing pass
                    this$1.__patch__(
                        this$1._vnode,
                        this$1.kept,
                        false, // hydrating
                        true // removeOnly (!important, avoids unnecessary
								// moves)
                    );
                    this$1._vnode = this$1.kept;
                    restoreActiveInstance();
                    update.call(this$1, vnode, hydrating);
                };
            },

            render: function render(h) {
                var tag = this.tag || this.$vnode.data.tag || 'span';
                var map = Object.create(null);
                var prevChildren = this.prevChildren = this.children;
                var rawChildren = this.$slots.default || [];
                var children = this.children = [];
                var transitionData = extractTransitionData(this);

                for (var i = 0; i < rawChildren.length; i++) {
                    var c = rawChildren[i];
                    if (c.tag) {
                        if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                            children.push(c);
                            map[c.key] = c;
                            (c.data || (c.data = {})).transition = transitionData;
                        } else {
                            var opts = c.componentOptions;
                            var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                            warn(("<transition-group> children must be keyed: <" + name + ">"));
                        }
                    }
                }

                if (prevChildren) {
                    var kept = [];
                    var removed = [];
                    for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
                        var c$1 = prevChildren[i$1];
                        c$1.data.transition = transitionData;
                        c$1.data.pos = c$1.elm.getBoundingClientRect();
                        if (map[c$1.key]) {
                            kept.push(c$1);
                        } else {
                            removed.push(c$1);
                        }
                    }
                    this.kept = h(tag, null, kept);
                    this.removed = removed;
                }

                return h(tag, null, children)
            },

            updated: function updated() {
                var children = this.prevChildren;
                var moveClass = this.moveClass || ((this.name || 'v') + '-move');
                if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
                    return
                }

                // we divide the work into three loops to avoid mixing DOM reads
				// and
                // writes
                // in each iteration - which helps prevent layout thrashing.
                children.forEach(callPendingCbs);
                children.forEach(recordPosition);
                children.forEach(applyTranslation);

                // force reflow to put everything in position
                // assign to this to avoid being removed in tree-shaking
                // $flow-disable-line
                this._reflow = document.body.offsetHeight;

                children.forEach(function (c) {
                    if (c.data.moved) {
                        var el = c.elm;
                        var s = el.style;
                        addTransitionClass(el, moveClass);
                        s.transform = s.WebkitTransform = s.transitionDuration = '';
                        el.addEventListener(transitionEndEvent, el._moveCb = function cb(e) {
                            if (e && e.target !== el) {
                                return
                            }
                            if (!e || /transform$/.test(e.propertyName)) {
                                el.removeEventListener(transitionEndEvent, cb);
                                el._moveCb = null;
                                removeTransitionClass(el, moveClass);
                            }
                        });
                    }
                });
            },

            methods: {
                hasMove: function hasMove(el, moveClass) {
                    /* istanbul ignore if */
                    if (!hasTransition) {
                        return false
                    }
                    /* istanbul ignore if */
                    if (this._hasMove) {
                        return this._hasMove
                    }
                    // Detect whether an element with the move class applied has
                    // CSS transitions. Since the element may be inside an
					// entering
                    // transition at this very moment, we make a clone of it and
					// remove
                    // all other transition classes applied to ensure only the
					// move class
                    // is applied.
                    var clone = el.cloneNode();
                    if (el._transitionClasses) {
                        el._transitionClasses.forEach(function (cls) {
                            removeClass(clone, cls);
                        });
                    }
                    addClass(clone, moveClass);
                    clone.style.display = 'none';
                    this.$el.appendChild(clone);
                    var info = getTransitionInfo(clone);
                    this.$el.removeChild(clone);
                    return (this._hasMove = info.hasTransform)
                }
            }
        };

        function callPendingCbs(c) {
            /* istanbul ignore if */
            if (c.elm._moveCb) {
                c.elm._moveCb();
            }
            /* istanbul ignore if */
            if (c.elm._enterCb) {
                c.elm._enterCb();
            }
        }

        function recordPosition(c) {
            c.data.newPos = c.elm.getBoundingClientRect();
        }

        function applyTranslation(c) {
            var oldPos = c.data.pos;
            var newPos = c.data.newPos;
            var dx = oldPos.left - newPos.left;
            var dy = oldPos.top - newPos.top;
            if (dx || dy) {
                c.data.moved = true;
                var s = c.elm.style;
                s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
                s.transitionDuration = '0s';
            }
        }

        var platformComponents = {
            Transition: Transition,
            TransitionGroup: TransitionGroup
        };

        /*  */

        // install platform specific utils
        Vue.config.mustUseProp = mustUseProp;
        Vue.config.isReservedTag = isReservedTag;
        Vue.config.isReservedAttr = isReservedAttr;
        Vue.config.getTagNamespace = getTagNamespace;
        Vue.config.isUnknownElement = isUnknownElement;

        // install platform runtime directives & components
        extend(Vue.options.directives, platformDirectives);
        extend(Vue.options.components, platformComponents);

        // install platform patch function
        Vue.prototype.__patch__ = inBrowser ? patch : noop;

        // public mount method
        Vue.prototype.$mount = function (
            el,
            hydrating) {
            el = el && inBrowser ? query(el) : undefined;
            return mountComponent(this, el, hydrating)
        };

        // devtools global hook
        /* istanbul ignore next */
        if (inBrowser) {
            setTimeout(function () {
                if (config.devtools) {
                    if (devtools) {
                        devtools.emit('init', Vue);
                    } else {
                        console[console.info ? 'info' : 'log'](
                            'Download the Vue Devtools extension for a better development experience:\n' +
                            'https://github.com/vuejs/vue-devtools');
                    }
                }
                if (config.productionTip !== false &&
                    typeof console !== 'undefined') {
                    console[console.info ? 'info' : 'log'](
                        "You are running Vue in development mode.\n" +
                        "Make sure to turn on production mode when deploying for production.\n" +
                        "See more tips at https://vuejs.org/guide/deployment.html");
                }
            }, 0);
        }

        /*  */

        var defaultTagRE = /\{\{((?:.|\r?\n)+?)\}\}/g;
        var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

        var buildRegex = cached(function (delimiters) {
                var open = delimiters[0].replace(regexEscapeRE, '\\$&');
                var close = delimiters[1].replace(regexEscapeRE, '\\$&');
                return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
            });

        function parseText(
            text,
            delimiters) {
            var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
            if (!tagRE.test(text)) {
                return
            }
            var tokens = [];
            var rawTokens = [];
            var lastIndex = tagRE.lastIndex = 0;
            var match,
            index,
            tokenValue;
            while ((match = tagRE.exec(text))) {
                index = match.index;
                // push text token
                if (index > lastIndex) {
                    rawTokens.push(tokenValue = text.slice(lastIndex, index));
                    tokens.push(JSON.stringify(tokenValue));
                }
                // tag token
                var exp = parseFilters(match[1].trim());
                tokens.push(("_s(" + exp + ")"));
                rawTokens.push({
                    '@binding': exp
                });
                lastIndex = index + match[0].length;
            }
            if (lastIndex < text.length) {
                rawTokens.push(tokenValue = text.slice(lastIndex));
                tokens.push(JSON.stringify(tokenValue));
            }
            return {
                expression: tokens.join('+'),
                tokens: rawTokens
            }
        }

        /*  */

        function transformNode(el, options) {
            var warn = options.warn || baseWarn;
            var staticClass = getAndRemoveAttr(el, 'class');
            if (staticClass) {
                var res = parseText(staticClass, options.delimiters);
                if (res) {
                    warn(
                        "class=\"" + staticClass + "\": " +
                        'Interpolation inside attributes has been removed. ' +
                        'Use v-bind or the colon shorthand instead. For example, ' +
                        'instead of <div class="{{ val }}">, use <div :class="val">.',
                        el.rawAttrsMap['class']);
                }
            }
            if (staticClass) {
                el.staticClass = JSON.stringify(staticClass);
            }
            var classBinding = getBindingAttr(el, 'class', false /* getStatic */);
            if (classBinding) {
                el.classBinding = classBinding;
            }
        }

        function genData(el) {
            var data = '';
            if (el.staticClass) {
                data += "staticClass:" + (el.staticClass) + ",";
            }
            if (el.classBinding) {
                data += "class:" + (el.classBinding) + ",";
            }
            return data
        }

        var klass$1 = {
            staticKeys: ['staticClass'],
            transformNode: transformNode,
            genData: genData
        };

        /*  */

        function transformNode$1(el, options) {
            var warn = options.warn || baseWarn;
            var staticStyle = getAndRemoveAttr(el, 'style');
            if (staticStyle) {
                /* istanbul ignore if */
                {
                    var res = parseText(staticStyle, options.delimiters);
                    if (res) {
                        warn(
                            "style=\"" + staticStyle + "\": " +
                            'Interpolation inside attributes has been removed. ' +
                            'Use v-bind or the colon shorthand instead. For example, ' +
                            'instead of <div style="{{ val }}">, use <div :style="val">.',
                            el.rawAttrsMap['style']);
                    }
                }
                el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
            }

            var styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
            if (styleBinding) {
                el.styleBinding = styleBinding;
            }
        }

        function genData$1(el) {
            var data = '';
            if (el.staticStyle) {
                data += "staticStyle:" + (el.staticStyle) + ",";
            }
            if (el.styleBinding) {
                data += "style:(" + (el.styleBinding) + "),";
            }
            return data
        }

        var style$1 = {
            staticKeys: ['staticStyle'],
            transformNode: transformNode$1,
            genData: genData$1
        };

        /*  */

        var decoder;

        var he = {
            decode: function decode(html) {
                decoder = decoder || document.createElement('div');
                decoder.innerHTML = html;
                return decoder.textContent
            }
        };

        /*  */

        var isUnaryTag = makeMap(
                'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
                'link,meta,param,source,track,wbr');

        // Elements that you can, intentionally, leave open
        // (and which close themselves)
        var canBeLeftOpenTag = makeMap(
                'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source');

        // HTML5 tags
		// https://html.spec.whatwg.org/multipage/indices.html#elements-3
        // Phrasing Content
        // https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
        var isNonPhrasingTag = makeMap(
                'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
                'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
                'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
                'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
                'title,tr,track');

        /**
		 * Not type-checking this file because it's mostly vendor code.
		 */

        // Regular Expressions for parsing tags and attributes
        var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
        var dynamicArgAttribute = /^\s*((?:v-[\w-]+:|@|:|#)\[[^=]+\][^\s"'<>\/=]*)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
        var ncname = "[a-zA-Z_][\\-\\.0-9_a-zA-Z" + (unicodeRegExp.source) + "]*";
        var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
        var startTagOpen = new RegExp(("^<" + qnameCapture));
        var startTagClose = /^\s*(\/?)>/;
        var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
        var doctype = /^<!DOCTYPE [^>]+>/i;
        // #7298: escape - to avoid being passed as HTML comment when inlined in
        // page
        var comment = /^<!\--/;
        var conditionalComment = /^<!\[/;

        // Special Elements (can contain anything)
        var isPlainTextElement = makeMap('script,style,textarea', true);
        var reCache = {};

        var decodingMap = {
            '&lt;': '<',
            '&gt;': '>',
            '&quot;': '"',
            '&amp;': '&',
            '&#10;': '\n',
            '&#9;': '\t',
            '&#39;': "'"
        };
        var encodedAttr = /&(?:lt|gt|quot|amp|#39);/g;
        var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#39|#10|#9);/g;

        // #5992
        var isIgnoreNewlineTag = makeMap('pre,textarea', true);
        var shouldIgnoreFirstNewline = function (tag, html) {
            return tag && isIgnoreNewlineTag(tag) && html[0] === '\n';
        };

        function decodeAttr(value, shouldDecodeNewlines) {
            var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
            return value.replace(re, function (match) {
                return decodingMap[match];
            })
        }

        function parseHTML(html, options) {
            var stack = [];
            var expectHTML = options.expectHTML;
            var isUnaryTag$$1 = options.isUnaryTag || no;
            var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
            var index = 0;
            var last,
            lastTag;
            while (html) {
                last = html;
                // Make sure we're not in a plaintext content element like
				// script/style
                if (!lastTag || !isPlainTextElement(lastTag)) {
                    var textEnd = html.indexOf('<');
                    if (textEnd === 0) {
                        // Comment:
                        if (comment.test(html)) {
                            var commentEnd = html.indexOf('-->');

                            if (commentEnd >= 0) {
                                if (options.shouldKeepComment) {
                                    options.comment(html.substring(4, commentEnd), index, index + commentEnd + 3);
                                }
                                advance(commentEnd + 3);
                                continue
                            }
                        }

                        // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                        if (conditionalComment.test(html)) {
                            var conditionalEnd = html.indexOf(']>');

                            if (conditionalEnd >= 0) {
                                advance(conditionalEnd + 2);
                                continue
                            }
                        }

                        // Doctype:
                        var doctypeMatch = html.match(doctype);
                        if (doctypeMatch) {
                            advance(doctypeMatch[0].length);
                            continue
                        }

                        // End tag:
                        var endTagMatch = html.match(endTag);
                        if (endTagMatch) {
                            var curIndex = index;
                            advance(endTagMatch[0].length);
                            parseEndTag(endTagMatch[1], curIndex, index);
                            continue
                        }

                        // Start tag:
                        var startTagMatch = parseStartTag();
                        if (startTagMatch) {
                            handleStartTag(startTagMatch);
                            if (shouldIgnoreFirstNewline(startTagMatch.tagName, html)) {
                                advance(1);
                            }
                            continue
                        }
                    }

                    var text = (void 0),
                    rest = (void 0),
                    next = (void 0);
                    if (textEnd >= 0) {
                        rest = html.slice(textEnd);
                        while (
                            !endTag.test(rest) &&
                            !startTagOpen.test(rest) &&
                            !comment.test(rest) &&
                            !conditionalComment.test(rest)) {
                            // < in plain text, be forgiving and treat it as
							// text
                            next = rest.indexOf('<', 1);
                            if (next < 0) {
                                break
                            }
                            textEnd += next;
                            rest = html.slice(textEnd);
                        }
                        text = html.substring(0, textEnd);
                    }

                    if (textEnd < 0) {
                        text = html;
                    }

                    if (text) {
                        advance(text.length);
                    }

                    if (options.chars && text) {
                        options.chars(text, index - text.length, index);
                    }
                } else {
                    var endTagLength = 0;
                    var stackedTag = lastTag.toLowerCase();
                    var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
                    var rest$1 = html.replace(reStackedTag, function (all, text, endTag) {
                            endTagLength = endTag.length;
                            if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                                text = text
                                    .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
                                    .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                            }
                            if (shouldIgnoreFirstNewline(stackedTag, text)) {
                                text = text.slice(1);
                            }
                            if (options.chars) {
                                options.chars(text);
                            }
                            return ''
                        });
                    index += html.length - rest$1.length;
                    html = rest$1;
                    parseEndTag(stackedTag, index - endTagLength, index);
                }

                if (html === last) {
                    options.chars && options.chars(html);
                    if (!stack.length && options.warn) {
                        options.warn(("Mal-formatted tag at end of template: \"" + html + "\""), {
                            start: index + html.length
                        });
                    }
                    break
                }
            }

            // Clean up any remaining tags
            parseEndTag();

            function advance(n) {
                index += n;
                html = html.substring(n);
            }

            function parseStartTag() {
                var start = html.match(startTagOpen);
                if (start) {
                    var match = {
                        tagName: start[1],
                        attrs: [],
                        start: index
                    };
                    advance(start[0].length);
                    var end,
                    attr;
                    while (!(end = html.match(startTagClose)) && (attr = html.match(dynamicArgAttribute) || html.match(attribute))) {
                        attr.start = index;
                        advance(attr[0].length);
                        attr.end = index;
                        match.attrs.push(attr);
                    }
                    if (end) {
                        match.unarySlash = end[1];
                        advance(end[0].length);
                        match.end = index;
                        return match
                    }
                }
            }

            function handleStartTag(match) {
                var tagName = match.tagName;
                var unarySlash = match.unarySlash;

                if (expectHTML) {
                    if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                        parseEndTag(lastTag);
                    }
                    if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                        parseEndTag(tagName);
                    }
                }

                var unary = isUnaryTag$$1(tagName) || !!unarySlash;

                var l = match.attrs.length;
                var attrs = new Array(l);
                for (var i = 0; i < l; i++) {
                    var args = match.attrs[i];
                    var value = args[3] || args[4] || args[5] || '';
                    var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
                         ? options.shouldDecodeNewlinesForHref
                         : options.shouldDecodeNewlines;
                    attrs[i] = {
                        name: args[1],
                        value: decodeAttr(value, shouldDecodeNewlines)
                    };
                    if (options.outputSourceRange) {
                        attrs[i].start = args.start + args[0].match(/^\s*/).length;
                        attrs[i].end = args.end;
                    }
                }

                if (!unary) {
                    stack.push({
                        tag: tagName,
                        lowerCasedTag: tagName.toLowerCase(),
                        attrs: attrs,
                        start: match.start,
                        end: match.end
                    });
                    lastTag = tagName;
                }

                if (options.start) {
                    options.start(tagName, attrs, unary, match.start, match.end);
                }
            }

            function parseEndTag(tagName, start, end) {
                var pos,
                lowerCasedTagName;
                if (start == null) {
                    start = index;
                }
                if (end == null) {
                    end = index;
                }

                // Find the closest opened tag of the same type
                if (tagName) {
                    lowerCasedTagName = tagName.toLowerCase();
                    for (pos = stack.length - 1; pos >= 0; pos--) {
                        if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                            break
                        }
                    }
                } else {
                    // If no tag name is provided, clean shop
                    pos = 0;
                }

                if (pos >= 0) {
                    // Close all the open elements, up the stack
                    for (var i = stack.length - 1; i >= pos; i--) {
                        if (i > pos || !tagName &&
                            options.warn) {
                            options.warn(
                                ("tag <" + (stack[i].tag) + "> has no matching end tag."), {
                                start: stack[i].start,
                                end: stack[i].end
                            });
                        }
                        if (options.end) {
                            options.end(stack[i].tag, start, end);
                        }
                    }

                    // Remove the open elements from the stack
                    stack.length = pos;
                    lastTag = pos && stack[pos - 1].tag;
                } else if (lowerCasedTagName === 'br') {
                    if (options.start) {
                        options.start(tagName, [], true, start, end);
                    }
                } else if (lowerCasedTagName === 'p') {
                    if (options.start) {
                        options.start(tagName, [], false, start, end);
                    }
                    if (options.end) {
                        options.end(tagName, start, end);
                    }
                }
            }
        }

        /*  */

        var onRE = /^@|^v-on:/;
        var dirRE = /^v-|^@|^:|^#/;
        var forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
        var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
        var stripParensRE = /^\(|\)$/g;
        var dynamicArgRE = /^\[.*\]$/;

        var argRE = /:(.*)$/;
        var bindRE = /^:|^\.|^v-bind:/;
        var modifierRE = /\.[^.\]]+(?=[^\]]*$)/g;

        var slotRE = /^v-slot(:|$)|^#/;

        var lineBreakRE = /[\r\n]/;
        var whitespaceRE$1 = /\s+/g;

        var invalidAttributeRE = /[\s"'<>\/=]/;

        var decodeHTMLCached = cached(he.decode);

        var emptySlotScopeToken = "_empty_";

        // configurable state
        var warn$2;
        var delimiters;
        var transforms;
        var preTransforms;
        var postTransforms;
        var platformIsPreTag;
        var platformMustUseProp;
        var platformGetTagNamespace;
        var maybeComponent;

        function createASTElement(
            tag,
            attrs,
            parent) {
            return {
                type: 1,
                tag: tag,
                attrsList: attrs,
                attrsMap: makeAttrsMap(attrs),
                rawAttrsMap: {},
                parent: parent,
                children: []
            }
        }

        /**
		 * Convert HTML string to AST.
		 */
        function parse(
            template,
            options) {
            warn$2 = options.warn || baseWarn;

            platformIsPreTag = options.isPreTag || no;
            platformMustUseProp = options.mustUseProp || no;
            platformGetTagNamespace = options.getTagNamespace || no;
            var isReservedTag = options.isReservedTag || no;
            maybeComponent = function (el) {
                return !!el.component || !isReservedTag(el.tag);
            };

            transforms = pluckModuleFunction(options.modules, 'transformNode');
            preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
            postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');

            delimiters = options.delimiters;

            var stack = [];
            var preserveWhitespace = options.preserveWhitespace !== false;
            var whitespaceOption = options.whitespace;
            var root;
            var currentParent;
            var inVPre = false;
            var inPre = false;
            var warned = false;

            function warnOnce(msg, range) {
                if (!warned) {
                    warned = true;
                    warn$2(msg, range);
                }
            }

            function closeElement(element) {
                trimEndingWhitespace(element);
                if (!inVPre && !element.processed) {
                    element = processElement(element, options);
                }
                // tree management
                if (!stack.length && element !== root) {
                    // allow root elements with v-if, v-else-if and v-else
                    if (root.if && (element.elseif || element.else)) { {
                            checkRootConstraints(element);
                        }
                        addIfCondition(root, {
                            exp: element.elseif,
                            block: element
                        });
                    } else {
                        warnOnce(
                            "Component template should contain exactly one root element. " +
                            "If you are using v-if on multiple elements, " +
                            "use v-else-if to chain them instead.", {
                            start: element.start
                        });
                    }
                }
                if (currentParent && !element.forbidden) {
                    if (element.elseif || element.else) {
                        processIfConditions(element, currentParent);
                    } else {
                        if (element.slotScope) {
                            // scoped slot
                            // keep it in the children list so that v-else(-if)
							// conditions can
                            // find it as the prev node.
                            var name = element.slotTarget || '"default"';
                            (currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                        }
                        currentParent.children.push(element);
                        element.parent = currentParent;
                    }
                }

                // final children cleanup
                // filter out scoped slots
                element.children = element.children.filter(function (c) {
                        return !(c).slotScope;
                    });
                // remove trailing whitespace node again
                trimEndingWhitespace(element);

                // check pre state
                if (element.pre) {
                    inVPre = false;
                }
                if (platformIsPreTag(element.tag)) {
                    inPre = false;
                }
                // apply post-transforms
                for (var i = 0; i < postTransforms.length; i++) {
                    postTransforms[i](element, options);
                }
            }

            function trimEndingWhitespace(el) {
                // remove trailing whitespace node
                if (!inPre) {
                    var lastNode;
                    while (
                        (lastNode = el.children[el.children.length - 1]) &&
                        lastNode.type === 3 &&
                        lastNode.text === ' ') {
                        el.children.pop();
                    }
                }
            }

            function checkRootConstraints(el) {
                if (el.tag === 'slot' || el.tag === 'template') {
                    warnOnce(
                        "Cannot use <" + (el.tag) + "> as component root element because it may " +
                        'contain multiple nodes.', {
                        start: el.start
                    });
                }
                if (el.attrsMap.hasOwnProperty('v-for')) {
                    warnOnce(
                        'Cannot use v-for on stateful component root element because ' +
                        'it renders multiple elements.',
                        el.rawAttrsMap['v-for']);
                }
            }

            parseHTML(template, {
                warn: warn$2,
                expectHTML: options.expectHTML,
                isUnaryTag: options.isUnaryTag,
                canBeLeftOpenTag: options.canBeLeftOpenTag,
                shouldDecodeNewlines: options.shouldDecodeNewlines,
                shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
                shouldKeepComment: options.comments,
                outputSourceRange: options.outputSourceRange,
                start: function start(tag, attrs, unary, start$1, end) {
                    // check namespace.
                    // inherit parent ns if there is one
                    var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

                    // handle IE svg bug
                    /* istanbul ignore if */
                    if (isIE && ns === 'svg') {
                        attrs = guardIESVGBug(attrs);
                    }

                    var element = createASTElement(tag, attrs, currentParent);
                    if (ns) {
                        element.ns = ns;
                    }
                    {
                        if (options.outputSourceRange) {
                            element.start = start$1;
                            element.end = end;
                            element.rawAttrsMap = element.attrsList.reduce(function (cumulated, attr) {
                                    cumulated[attr.name] = attr;
                                    return cumulated
                                }, {});
                        }
                        attrs.forEach(function (attr) {
                            if (invalidAttributeRE.test(attr.name)) {
                                warn$2(
                                    "Invalid dynamic argument expression: attribute names cannot contain " +
                                    "spaces, quotes, <, >, / or =.", {
                                    start: attr.start + attr.name.indexOf("["),
                                    end: attr.start + attr.name.length
                                });
                            }
                        });
                    }

                    if (isForbiddenTag(element) && !isServerRendering()) {
                        element.forbidden = true;
                        warn$2(
                            'Templates should only be responsible for mapping the state to the ' +
                            'UI. Avoid placing tags with side-effects in your templates, such as ' +
                            "<" + tag + ">" + ', as they will not be parsed.', {
                            start: element.start
                        });
                    }

                    // apply pre-transforms
                    for (var i = 0; i < preTransforms.length; i++) {
                        element = preTransforms[i](element, options) || element;
                    }

                    if (!inVPre) {
                        processPre(element);
                        if (element.pre) {
                            inVPre = true;
                        }
                    }
                    if (platformIsPreTag(element.tag)) {
                        inPre = true;
                    }
                    if (inVPre) {
                        processRawAttrs(element);
                    } else if (!element.processed) {
                        // structural directives
                        processFor(element);
                        processIf(element);
                        processOnce(element);
                    }

                    if (!root) {
                        root = element;{
                            checkRootConstraints(root);
                        }
                    }

                    if (!unary) {
                        currentParent = element;
                        stack.push(element);
                    } else {
                        closeElement(element);
                    }
                },

                end: function end(tag, start, end$1) {
                    var element = stack[stack.length - 1];
                    // pop stack
                    stack.length -= 1;
                    currentParent = stack[stack.length - 1];
                    if (options.outputSourceRange) {
                        element.end = end$1;
                    }
                    closeElement(element);
                },

                chars: function chars(text, start, end) {
                    if (!currentParent) { {
                            if (text === template) {
                                warnOnce(
                                    'Component template requires a root element, rather than just text.', {
                                    start: start
                                });
                            } else if ((text = text.trim())) {
                                warnOnce(
                                    ("text \"" + text + "\" outside root element will be ignored."), {
                                    start: start
                                });
                            }
                        }
                        return
                    }
                    // IE textarea placeholder bug
                    /* istanbul ignore if */
                    if (isIE &&
                        currentParent.tag === 'textarea' &&
                        currentParent.attrsMap.placeholder === text) {
                        return
                    }
                    var children = currentParent.children;
                    if (inPre || text.trim()) {
                        text = isTextTag(currentParent) ? text : decodeHTMLCached(text);
                    } else if (!children.length) {
                        // remove the whitespace-only node right after an
						// opening tag
                        text = '';
                    } else if (whitespaceOption) {
                        if (whitespaceOption === 'condense') {
                            // in condense mode, remove the whitespace node if
							// it contains
                            // line break, otherwise condense to a single space
                            text = lineBreakRE.test(text) ? '' : ' ';
                        } else {
                            text = ' ';
                        }
                    } else {
                        text = preserveWhitespace ? ' ' : '';
                    }
                    if (text) {
                        if (!inPre && whitespaceOption === 'condense') {
                            // condense consecutive whitespaces into single
							// space
                            text = text.replace(whitespaceRE$1, ' ');
                        }
                        var res;
                        var child;
                        if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
                            child = {
                                type: 2,
                                expression: res.expression,
                                tokens: res.tokens,
                                text: text
                            };
                        } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                            child = {
                                type: 3,
                                text: text
                            };
                        }
                        if (child) {
                            if (options.outputSourceRange) {
                                child.start = start;
                                child.end = end;
                            }
                            children.push(child);
                        }
                    }
                },
                comment: function comment(text, start, end) {
                    // adding anything as a sibling to the root node is
					// forbidden
                    // comments should still be allowed, but ignored
                    if (currentParent) {
                        var child = {
                            type: 3,
                            text: text,
                            isComment: true
                        };
                        if (options.outputSourceRange) {
                            child.start = start;
                            child.end = end;
                        }
                        currentParent.children.push(child);
                    }
                }
            });
            return root
        }

        function processPre(el) {
            if (getAndRemoveAttr(el, 'v-pre') != null) {
                el.pre = true;
            }
        }

        function processRawAttrs(el) {
            var list = el.attrsList;
            var len = list.length;
            if (len) {
                var attrs = el.attrs = new Array(len);
                for (var i = 0; i < len; i++) {
                    attrs[i] = {
                        name: list[i].name,
                        value: JSON.stringify(list[i].value)
                    };
                    if (list[i].start != null) {
                        attrs[i].start = list[i].start;
                        attrs[i].end = list[i].end;
                    }
                }
            } else if (!el.pre) {
                // non root node in pre blocks with no attributes
                el.plain = true;
            }
        }

        function processElement(
            element,
            options) {
            processKey(element);

            // determine whether this is a plain element after
            // removing structural attributes
            element.plain = (
                !element.key &&
                !element.scopedSlots &&
                !element.attrsList.length);

            processRef(element);
            processSlotContent(element);
            processSlotOutlet(element);
            processComponent(element);
            for (var i = 0; i < transforms.length; i++) {
                element = transforms[i](element, options) || element;
            }
            processAttrs(element);
            return element
        }

        function processKey(el) {
            var exp = getBindingAttr(el, 'key');
            if (exp) { {
                    if (el.tag === 'template') {
                        warn$2(
                            "<template> cannot be keyed. Place the key on real elements instead.",
                            getRawBindingAttr(el, 'key'));
                    }
                    if (el.for) {
                        var iterator = el.iterator2 || el.iterator1;
                        var parent = el.parent;
                        if (iterator && iterator === exp && parent && parent.tag === 'transition-group') {
                            warn$2(
                                "Do not use v-for index as key on <transition-group> children, " +
                                "this is the same as not using keys.",
                                getRawBindingAttr(el, 'key'),
                                true /* tip */);
                        }
                    }
                }
                el.key = exp;
            }
        }

        function processRef(el) {
            var ref = getBindingAttr(el, 'ref');
            if (ref) {
                el.ref = ref;
                el.refInFor = checkInFor(el);
            }
        }

        function processFor(el) {
            var exp;
            if ((exp = getAndRemoveAttr(el, 'v-for'))) {
                var res = parseFor(exp);
                if (res) {
                    extend(el, res);
                } else {
                    warn$2(
                        ("Invalid v-for expression: " + exp),
                        el.rawAttrsMap['v-for']);
                }
            }
        }

        function parseFor(exp) {
            var inMatch = exp.match(forAliasRE);
            if (!inMatch) {
                return
            }
            var res = {};
            res.for = inMatch[2].trim();
            var alias = inMatch[1].trim().replace(stripParensRE, '');
            var iteratorMatch = alias.match(forIteratorRE);
            if (iteratorMatch) {
                res.alias = alias.replace(forIteratorRE, '').trim();
                res.iterator1 = iteratorMatch[1].trim();
                if (iteratorMatch[2]) {
                    res.iterator2 = iteratorMatch[2].trim();
                }
            } else {
                res.alias = alias;
            }
            return res
        }

        function processIf(el) {
            var exp = getAndRemoveAttr(el, 'v-if');
            if (exp) {
                el.if = exp;
                addIfCondition(el, {
                    exp: exp,
                    block: el
                });
            } else {
                if (getAndRemoveAttr(el, 'v-else') != null) {
                    el.else = true;
                }
                var elseif = getAndRemoveAttr(el, 'v-else-if');
                if (elseif) {
                    el.elseif = elseif;
                }
            }
        }

        function processIfConditions(el, parent) {
            var prev = findPrevElement(parent.children);
            if (prev && prev.if) {
                addIfCondition(prev, {
                    exp: el.elseif,
                    block: el
                });
            } else {
                warn$2(
                    "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
                    "used on element <" + (el.tag) + "> without corresponding v-if.",
                    el.rawAttrsMap[el.elseif ? 'v-else-if' : 'v-else']);
            }
        }

        function findPrevElement(children) {
            var i = children.length;
            while (i--) {
                if (children[i].type === 1) {
                    return children[i]
                } else {
                    if (children[i].text !== ' ') {
                        warn$2(
                            "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
                            "will be ignored.",
                            children[i]);
                    }
                    children.pop();
                }
            }
        }

        function addIfCondition(el, condition) {
            if (!el.ifConditions) {
                el.ifConditions = [];
            }
            el.ifConditions.push(condition);
        }

        function processOnce(el) {
            var once$$1 = getAndRemoveAttr(el, 'v-once');
            if (once$$1 != null) {
                el.once = true;
            }
        }

        // handle content being passed to a component as slot,
        // e.g. <template slot="xxx">, <div slot-scope="xxx">
        function processSlotContent(el) {
            var slotScope;
            if (el.tag === 'template') {
                slotScope = getAndRemoveAttr(el, 'scope');
                /* istanbul ignore if */
                if (slotScope) {
                    warn$2(
                        "the \"scope\" attribute for scoped slots have been deprecated and " +
                        "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
                        "can also be used on plain elements in addition to <template> to " +
                        "denote scoped slots.",
                        el.rawAttrsMap['scope'],
                        true);
                }
                el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
            } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
                /* istanbul ignore if */
                if (el.attrsMap['v-for']) {
                    warn$2(
                        "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
                        "(v-for takes higher priority). Use a wrapper <template> for the " +
                        "scoped slot to make it clearer.",
                        el.rawAttrsMap['slot-scope'],
                        true);
                }
                el.slotScope = slotScope;
            }

            // slot="xxx"
            var slotTarget = getBindingAttr(el, 'slot');
            if (slotTarget) {
                el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
                el.slotTargetDynamic = !!(el.attrsMap[':slot'] || el.attrsMap['v-bind:slot']);
                // preserve slot as an attribute for native shadow DOM compat
                // only for non-scoped slots.
                if (el.tag !== 'template' && !el.slotScope) {
                    addAttr(el, 'slot', slotTarget, getRawBindingAttr(el, 'slot'));
                }
            }

            // 2.6 v-slot syntax
            {
                if (el.tag === 'template') {
                    // v-slot on <template>
                    var slotBinding = getAndRemoveAttrByRegex(el, slotRE);
                    if (slotBinding) { {
                            if (el.slotTarget || el.slotScope) {
                                warn$2(
                                    "Unexpected mixed usage of different slot syntaxes.",
                                    el);
                            }
                            if (el.parent && !maybeComponent(el.parent)) {
                                warn$2(
                                    "<template v-slot> can only appear at the root level inside " +
                                    "the receiving component",
                                    el);
                            }
                        }
                        var ref = getSlotName(slotBinding);
                        var name = ref.name;
                        var dynamic = ref.dynamic;
                        el.slotTarget = name;
                        el.slotTargetDynamic = dynamic;
                        el.slotScope = slotBinding.value || emptySlotScopeToken; // force
																					// it
                        // into a
                        // scoped
                        // slot for
                        // perf
                    }
                } else {
                    // v-slot on component, denotes default slot
                    var slotBinding$1 = getAndRemoveAttrByRegex(el, slotRE);
                    if (slotBinding$1) { {
                            if (!maybeComponent(el)) {
                                warn$2(
                                    "v-slot can only be used on components or <template>.",
                                    slotBinding$1);
                            }
                            if (el.slotScope || el.slotTarget) {
                                warn$2(
                                    "Unexpected mixed usage of different slot syntaxes.",
                                    el);
                            }
                            if (el.scopedSlots) {
                                warn$2(
                                    "To avoid scope ambiguity, the default slot should also use " +
                                    "<template> syntax when there are other named slots.",
                                    slotBinding$1);
                            }
                        }
                        // add the component's children to its default slot
                        var slots = el.scopedSlots || (el.scopedSlots = {});
                        var ref$1 = getSlotName(slotBinding$1);
                        var name$1 = ref$1.name;
                        var dynamic$1 = ref$1.dynamic;
                        var slotContainer = slots[name$1] = createASTElement('template', [], el);
                        slotContainer.slotTarget = name$1;
                        slotContainer.slotTargetDynamic = dynamic$1;
                        slotContainer.children = el.children.filter(function (c) {
                                if (!c.slotScope) {
                                    c.parent = slotContainer;
                                    return true
                                }
                            });
                        slotContainer.slotScope = slotBinding$1.value || emptySlotScopeToken;
                        // remove children as they are returned from scopedSlots
						// now
                        el.children = [];
                        // mark el non-plain so data gets generated
                        el.plain = false;
                    }
                }
            }
        }

        function getSlotName(binding) {
            var name = binding.name.replace(slotRE, '');
            if (!name) {
                if (binding.name[0] !== '#') {
                    name = 'default';
                } else {
                    warn$2(
                        "v-slot shorthand syntax requires a slot name.",
                        binding);
                }
            }
            return dynamicArgRE.test(name)
            // dynamic [name]
             ? {
                name: name.slice(1, -1),
                dynamic: true
            }
            // static name
             : {
                name: ("\"" + name + "\""),
                dynamic: false
            }
        }

        // handle <slot/> outlets
        function processSlotOutlet(el) {
            if (el.tag === 'slot') {
                el.slotName = getBindingAttr(el, 'name');
                if (el.key) {
                    warn$2(
                        "`key` does not work on <slot> because slots are abstract outlets " +
                        "and can possibly expand into multiple elements. " +
                        "Use the key on a wrapping element instead.",
                        getRawBindingAttr(el, 'key'));
                }
            }
        }

        function processComponent(el) {
            var binding;
            if ((binding = getBindingAttr(el, 'is'))) {
                el.component = binding;
            }
            if (getAndRemoveAttr(el, 'inline-template') != null) {
                el.inlineTemplate = true;
            }
        }

        function processAttrs(el) {
            var list = el.attrsList;
            var i,
            l,
            name,
            rawName,
            value,
            modifiers,
            syncGen,
            isDynamic;
            for (i = 0, l = list.length; i < l; i++) {
                name = rawName = list[i].name;
                value = list[i].value;
                if (dirRE.test(name)) {
                    // mark element as dynamic
                    el.hasBindings = true;
                    // modifiers
                    modifiers = parseModifiers(name.replace(dirRE, ''));
                    // support .foo shorthand syntax for the .prop modifier
                    if (modifiers) {
                        name = name.replace(modifierRE, '');
                    }
                    if (bindRE.test(name)) { // v-bind
                        name = name.replace(bindRE, '');
                        value = parseFilters(value);
                        isDynamic = dynamicArgRE.test(name);
                        if (isDynamic) {
                            name = name.slice(1, -1);
                        }
                        if (
                            value.trim().length === 0) {
                            warn$2(
                                ("The value for a v-bind expression cannot be empty. Found in \"v-bind:" + name + "\""));
                        }
                        if (modifiers) {
                            if (modifiers.prop && !isDynamic) {
                                name = camelize(name);
                                if (name === 'innerHtml') {
                                    name = 'innerHTML';
                                }
                            }
                            if (modifiers.camel && !isDynamic) {
                                name = camelize(name);
                            }
                            if (modifiers.sync) {
                                syncGen = genAssignmentCode(value, "$event");
                                if (!isDynamic) {
                                    addHandler(
                                        el,
                                        ("update:" + (camelize(name))),
                                        syncGen,
                                        null,
                                        false,
                                        warn$2,
                                        list[i]);
                                    if (hyphenate(name) !== camelize(name)) {
                                        addHandler(
                                            el,
                                            ("update:" + (hyphenate(name))),
                                            syncGen,
                                            null,
                                            false,
                                            warn$2,
                                            list[i]);
                                    }
                                } else {
                                    // handler w/ dynamic event name
                                    addHandler(
                                        el,
                                        ("\"update:\"+(" + name + ")"),
                                        syncGen,
                                        null,
                                        false,
                                        warn$2,
                                        list[i],
                                        true // dynamic
                                    );
                                }
                            }
                        }
                        if ((modifiers && modifiers.prop) || (
                                !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name))) {
                            addProp(el, name, value, list[i], isDynamic);
                        } else {
                            addAttr(el, name, value, list[i], isDynamic);
                        }
                    } else if (onRE.test(name)) { // v-on
                        name = name.replace(onRE, '');
                        isDynamic = dynamicArgRE.test(name);
                        if (isDynamic) {
                            name = name.slice(1, -1);
                        }
                        addHandler(el, name, value, modifiers, false, warn$2, list[i], isDynamic);
                    } else { // normal directives
                        name = name.replace(dirRE, '');
                        // parse arg
                        var argMatch = name.match(argRE);
                        var arg = argMatch && argMatch[1];
                        isDynamic = false;
                        if (arg) {
                            name = name.slice(0,  - (arg.length + 1));
                            if (dynamicArgRE.test(arg)) {
                                arg = arg.slice(1, -1);
                                isDynamic = true;
                            }
                        }
                        addDirective(el, name, rawName, value, arg, isDynamic, modifiers, list[i]);
                        if (name === 'model') {
                            checkForAliasModel(el, value);
                        }
                    }
                } else {
                    // literal attribute
                    {
                        var res = parseText(value, delimiters);
                        if (res) {
                            warn$2(
                                name + "=\"" + value + "\": " +
                                'Interpolation inside attributes has been removed. ' +
                                'Use v-bind or the colon shorthand instead. For example, ' +
                                'instead of <div id="{{ val }}">, use <div :id="val">.',
                                list[i]);
                        }
                    }
                    addAttr(el, name, JSON.stringify(value), list[i]);
                    // #6887 firefox doesn't update muted state if set via
					// attribute
                    // even immediately after element creation
                    if (!el.component &&
                        name === 'muted' &&
                        platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                        addProp(el, name, 'true', list[i]);
                    }
                }
            }
        }

        function checkInFor(el) {
            var parent = el;
            while (parent) {
                if (parent.for !== undefined) {
                    return true
                }
                parent = parent.parent;
            }
            return false
        }

        function parseModifiers(name) {
            var match = name.match(modifierRE);
            if (match) {
                var ret = {};
                match.forEach(function (m) {
                    ret[m.slice(1)] = true;
                });
                return ret
            }
        }

        function makeAttrsMap(attrs) {
            var map = {};
            for (var i = 0, l = attrs.length; i < l; i++) {
                if (
                    map[attrs[i].name] && !isIE && !isEdge) {
                    warn$2('duplicate attribute: ' + attrs[i].name, attrs[i]);
                }
                map[attrs[i].name] = attrs[i].value;
            }
            return map
        }

        // for script (e.g. type="x/template") or style, do not decode content
        function isTextTag(el) {
            return el.tag === 'script' || el.tag === 'style'
        }

        function isForbiddenTag(el) {
            return (
                el.tag === 'style' ||
                (el.tag === 'script' && (
                        !el.attrsMap.type ||
                        el.attrsMap.type === 'text/javascript')))
        }

        var ieNSBug = /^xmlns:NS\d+/;
        var ieNSPrefix = /^NS\d+:/;

        /* istanbul ignore next */
        function guardIESVGBug(attrs) {
            var res = [];
            for (var i = 0; i < attrs.length; i++) {
                var attr = attrs[i];
                if (!ieNSBug.test(attr.name)) {
                    attr.name = attr.name.replace(ieNSPrefix, '');
                    res.push(attr);
                }
            }
            return res
        }

        function checkForAliasModel(el, value) {
            var _el = el;
            while (_el) {
                if (_el.for && _el.alias === value) {
                    warn$2(
                        "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                        "You are binding v-model directly to a v-for iteration alias. " +
                        "This will not be able to modify the v-for source array because " +
                        "writing to the alias is like modifying a function local variable. " +
                        "Consider using an array of objects and use v-model on an object property instead.",
                        el.rawAttrsMap['v-model']);
                }
                _el = _el.parent;
            }
        }

        /*  */

        function preTransformNode(el, options) {
            if (el.tag === 'input') {
                var map = el.attrsMap;
                if (!map['v-model']) {
                    return
                }

                var typeBinding;
                if (map[':type'] || map['v-bind:type']) {
                    typeBinding = getBindingAttr(el, 'type');
                }
                if (!map.type && !typeBinding && map['v-bind']) {
                    typeBinding = "(" + (map['v-bind']) + ").type";
                }

                if (typeBinding) {
                    var ifCondition = getAndRemoveAttr(el, 'v-if', true);
                    var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
                    var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
                    var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
                    // 1. checkbox
                    var branch0 = cloneASTElement(el);
                    // process for on the main node
                    processFor(branch0);
                    addRawAttr(branch0, 'type', 'checkbox');
                    processElement(branch0, options);
                    branch0.processed = true; // prevent it from
												// double-processed
                    branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
                    addIfCondition(branch0, {
                        exp: branch0.if,
                        block: branch0
                    });
                    // 2. add radio else-if condition
                    var branch1 = cloneASTElement(el);
                    getAndRemoveAttr(branch1, 'v-for', true);
                    addRawAttr(branch1, 'type', 'radio');
                    processElement(branch1, options);
                    addIfCondition(branch0, {
                        exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
                        block: branch1
                    });
                    // 3. other
                    var branch2 = cloneASTElement(el);
                    getAndRemoveAttr(branch2, 'v-for', true);
                    addRawAttr(branch2, ':type', typeBinding);
                    processElement(branch2, options);
                    addIfCondition(branch0, {
                        exp: ifCondition,
                        block: branch2
                    });

                    if (hasElse) {
                        branch0.else = true;
                    } else if (elseIfCondition) {
                        branch0.elseif = elseIfCondition;
                    }

                    return branch0
                }
            }
        }

        function cloneASTElement(el) {
            return createASTElement(el.tag, el.attrsList.slice(), el.parent)
        }

        var model$1 = {
            preTransformNode: preTransformNode
        };

        var modules$1 = [
            klass$1,
            style$1,
            model$1
        ];

        /*  */

        function text(el, dir) {
            if (dir.value) {
                addProp(el, 'textContent', ("_s(" + (dir.value) + ")"), dir);
            }
        }

        /*  */

        function html(el, dir) {
            if (dir.value) {
                addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"), dir);
            }
        }

        var directives$1 = {
            model: model,
            text: text,
            html: html
        };

        /*  */

        var baseOptions = {
            expectHTML: true,
            modules: modules$1,
            directives: directives$1,
            isPreTag: isPreTag,
            isUnaryTag: isUnaryTag,
            mustUseProp: mustUseProp,
            canBeLeftOpenTag: canBeLeftOpenTag,
            isReservedTag: isReservedTag,
            getTagNamespace: getTagNamespace,
            staticKeys: genStaticKeys(modules$1)
        };

        /*  */

        var isStaticKey;
        var isPlatformReservedTag;

        var genStaticKeysCached = cached(genStaticKeys$1);

        /**
		 * Goal of the optimizer: walk the generated template AST tree and
		 * detect sub-trees that are purely static, i.e. parts of the DOM that
		 * never needs to change.
		 * 
		 * Once we detect these sub-trees, we can:
		 * 
		 * 1. Hoist them into constants, so that we no longer need to create
		 * fresh nodes for them on each re-render; 2. Completely skip them in
		 * the patching process.
		 */
        function optimize(root, options) {
            if (!root) {
                return
            }
            isStaticKey = genStaticKeysCached(options.staticKeys || '');
            isPlatformReservedTag = options.isReservedTag || no;
            // first pass: mark all non-static nodes.
            markStatic$1(root);
            // second pass: mark static roots.
            markStaticRoots(root, false);
        }

        function genStaticKeys$1(keys) {
            return makeMap(
                'type,tag,attrsList,attrsMap,plain,parent,children,attrs,start,end,rawAttrsMap' +
                (keys ? ',' + keys : ''))
        }

        function markStatic$1(node) {
            node.static = isStatic(node);
            if (node.type === 1) {
                // do not make component slot content static. this avoids
                // 1. components not able to mutate slot nodes
                // 2. static slot content fails for hot-reloading
                if (
                    !isPlatformReservedTag(node.tag) &&
                    node.tag !== 'slot' &&
                    node.attrsMap['inline-template'] == null) {
                    return
                }
                for (var i = 0, l = node.children.length; i < l; i++) {
                    var child = node.children[i];
                    markStatic$1(child);
                    if (!child.static) {
                        node.static = false;
                    }
                }
                if (node.ifConditions) {
                    for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                        var block = node.ifConditions[i$1].block;
                        markStatic$1(block);
                        if (!block.static) {
                            node.static = false;
                        }
                    }
                }
            }
        }

        function markStaticRoots(node, isInFor) {
            if (node.type === 1) {
                if (node.static || node.once) {
                    node.staticInFor = isInFor;
                }
                // For a node to qualify as a static root, it should have
				// children that
                // are not just static text. Otherwise the cost of hoisting out
				// will
                // outweigh the benefits and it's better off to just always
				// render it
                // fresh.
                if (node.static && node.children.length && !(
                        node.children.length === 1 &&
                        node.children[0].type === 3)) {
                    node.staticRoot = true;
                    return
                } else {
                    node.staticRoot = false;
                }
                if (node.children) {
                    for (var i = 0, l = node.children.length; i < l; i++) {
                        markStaticRoots(node.children[i], isInFor || !!node.for);
                    }
                }
                if (node.ifConditions) {
                    for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                        markStaticRoots(node.ifConditions[i$1].block, isInFor);
                    }
                }
            }
        }

        function isStatic(node) {
            if (node.type === 2) { // expression
                return false
            }
            if (node.type === 3) { // text
                return true
            }
            return !!(node.pre || (
                    !node.hasBindings && // no dynamic bindings
                    !node.if && !node.for && // not v-if or v-for or v-else
                    !isBuiltInTag(node.tag) && // not a built-in
                    isPlatformReservedTag(node.tag) && // not a component
                    !isDirectChildOfTemplateFor(node) &&
                    Object.keys(node).every(isStaticKey)))
        }

        function isDirectChildOfTemplateFor(node) {
            while (node.parent) {
                node = node.parent;
                if (node.tag !== 'template') {
                    return false
                }
                if (node.for) {
                    return true
                }
            }
            return false
        }

        /*  */

        var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function(?:\s+[\w$]+)?\s*\(/;
        var fnInvokeRE = /\([^)]*?\);*$/;
        var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;

        // KeyboardEvent.keyCode aliases
        var keyCodes = {
            esc: 27,
            tab: 9,
            enter: 13,
            space: 32,
            up: 38,
            left: 37,
            right: 39,
            down: 40,
            'delete': [8, 46]
        };

        // KeyboardEvent.key aliases
        var keyNames = {
            // #7880: IE11 and Edge use `Esc` for Escape key name.
            esc: ['Esc', 'Escape'],
            tab: 'Tab',
            enter: 'Enter',
            // #9112: IE11 uses `Spacebar` for Space key name.
            space: [' ', 'Spacebar'],
            // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
            up: ['Up', 'ArrowUp'],
            left: ['Left', 'ArrowLeft'],
            right: ['Right', 'ArrowRight'],
            down: ['Down', 'ArrowDown'],
            // #9112: IE11 uses `Del` for Delete key name.
            'delete': ['Backspace', 'Delete', 'Del']
        };

        // #4868: modifiers that prevent the execution of the listener
        // need to explicitly return null so that we can determine whether to
		// remove
        // the listener for .once
        var genGuard = function (condition) {
            return ("if(" + condition + ")return null;");
        };

        var modifierCode = {
            stop: '$event.stopPropagation();',
            prevent: '$event.preventDefault();',
            self: genGuard("$event.target !== $event.currentTarget"),
            ctrl: genGuard("!$event.ctrlKey"),
            shift: genGuard("!$event.shiftKey"),
            alt: genGuard("!$event.altKey"),
            meta: genGuard("!$event.metaKey"),
            left: genGuard("'button' in $event && $event.button !== 0"),
            middle: genGuard("'button' in $event && $event.button !== 1"),
            right: genGuard("'button' in $event && $event.button !== 2")
        };

        function genHandlers(
            events,
            isNative) {
            var prefix = isNative ? 'nativeOn:' : 'on:';
            var staticHandlers = "";
            var dynamicHandlers = "";
            for (var name in events) {
                var handlerCode = genHandler(events[name]);
                if (events[name] && events[name].dynamic) {
                    dynamicHandlers += name + "," + handlerCode + ",";
                } else {
                    staticHandlers += "\"" + name + "\":" + handlerCode + ",";
                }
            }
            staticHandlers = "{" + (staticHandlers.slice(0, -1)) + "}";
            if (dynamicHandlers) {
                return prefix + "_d(" + staticHandlers + ",[" + (dynamicHandlers.slice(0, -1)) + "])"
            } else {
                return prefix + staticHandlers
            }
        }

        function genHandler(handler) {
            if (!handler) {
                return 'function(){}'
            }

            if (Array.isArray(handler)) {
                return ("[" + (handler.map(function (handler) {
                            return genHandler(handler);
                        }).join(',')) + "]")
            }

            var isMethodPath = simplePathRE.test(handler.value);
            var isFunctionExpression = fnExpRE.test(handler.value);
            var isFunctionInvocation = simplePathRE.test(handler.value.replace(fnInvokeRE, ''));

            if (!handler.modifiers) {
                if (isMethodPath || isFunctionExpression) {
                    return handler.value
                }
                return ("function($event){" + (isFunctionInvocation ? ("return " + (handler.value)) : handler.value) + "}") // inline
                // statement
            } else {
                var code = '';
                var genModifierCode = '';
                var keys = [];
                for (var key in handler.modifiers) {
                    if (modifierCode[key]) {
                        genModifierCode += modifierCode[key];
                        // left/right
                        if (keyCodes[key]) {
                            keys.push(key);
                        }
                    } else if (key === 'exact') {
                        var modifiers = (handler.modifiers);
                        genModifierCode += genGuard(
                            ['ctrl', 'shift', 'alt', 'meta']
                            .filter(function (keyModifier) {
                                return !modifiers[keyModifier];
                            })
                            .map(function (keyModifier) {
                                return ("$event." + keyModifier + "Key");
                            })
                            .join('||'));
                    } else {
                        keys.push(key);
                    }
                }
                if (keys.length) {
                    code += genKeyFilter(keys);
                }
                // Make sure modifiers like prevent and stop get executed after
				// key
                // filtering
                if (genModifierCode) {
                    code += genModifierCode;
                }
                var handlerCode = isMethodPath
                     ? ("return " + (handler.value) + "($event)")
                     : isFunctionExpression
                     ? ("return (" + (handler.value) + ")($event)")
                     : isFunctionInvocation
                     ? ("return " + (handler.value))
                     : handler.value;
                return ("function($event){" + code + handlerCode + "}")
            }
        }

        function genKeyFilter(keys) {
            return (
                // make sure the key filters only apply to KeyboardEvents
                // #9441: can't use 'keyCode' in $event because Chrome autofill
				// fires
                // fake
                // key events that do not have keyCode property...
                "if(!$event.type.indexOf('key')&&" +
                (keys.map(genFilterCode).join('&&')) + ")return null;")
        }

        function genFilterCode(key) {
            var keyVal = parseInt(key, 10);
            if (keyVal) {
                return ("$event.keyCode!==" + keyVal)
            }
            var keyCode = keyCodes[key];
            var keyName = keyNames[key];
            return (
                "_k($event.keyCode," +
                (JSON.stringify(key)) + "," +
                (JSON.stringify(keyCode)) + "," +
                "$event.key," +
                "" + (JSON.stringify(keyName)) +
                ")")
        }

        /*  */

        function on(el, dir) {
            if (dir.modifiers) {
                warn("v-on without argument does not support modifiers.");
            }
            el.wrapListeners = function (code) {
                return ("_g(" + code + "," + (dir.value) + ")");
            };
        }

        /*  */

        function bind$1(el, dir) {
            el.wrapData = function (code) {
                return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
            };
        }

        /*  */

        var baseDirectives = {
            on: on,
            bind: bind$1,
            cloak: noop
        };

        /*  */

        var CodegenState = function CodegenState(options) {
            this.options = options;
            this.warn = options.warn || baseWarn;
            this.transforms = pluckModuleFunction(options.modules, 'transformCode');
            this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
            this.directives = extend(extend({}, baseDirectives), options.directives);
            var isReservedTag = options.isReservedTag || no;
            this.maybeComponent = function (el) {
                return !!el.component || !isReservedTag(el.tag);
            };
            this.onceId = 0;
            this.staticRenderFns = [];
            this.pre = false;
        };

        function generate(
            ast,
            options) {
            var state = new CodegenState(options);
            var code = ast ? genElement(ast, state) : '_c("div")';
            return {
                render: ("with(this){return " + code + "}"),
                staticRenderFns: state.staticRenderFns
            }
        }

        function genElement(el, state) {
            if (el.parent) {
                el.pre = el.pre || el.parent.pre;
            }

            if (el.staticRoot && !el.staticProcessed) {
                return genStatic(el, state)
            } else if (el.once && !el.onceProcessed) {
                return genOnce(el, state)
            } else if (el.for && !el.forProcessed) {
                return genFor(el, state)
            } else if (el.if && !el.ifProcessed) {
                return genIf(el, state)
            } else if (el.tag === 'template' && !el.slotTarget && !state.pre) {
                return genChildren(el, state) || 'void 0'
            } else if (el.tag === 'slot') {
                return genSlot(el, state)
            } else {
                // component or element
                var code;
                if (el.component) {
                    code = genComponent(el.component, el, state);
                } else {
                    var data;
                    if (!el.plain || (el.pre && state.maybeComponent(el))) {
                        data = genData$2(el, state);
                    }

                    var children = el.inlineTemplate ? null : genChildren(el, state, true);
                    code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
                }
                // module transforms
                for (var i = 0; i < state.transforms.length; i++) {
                    code = state.transforms[i](el, code);
                }
                return code
            }
        }

        // hoist static sub-trees out
        function genStatic(el, state) {
            el.staticProcessed = true;
            // Some elements (templates) need to behave differently inside of a
			// v-pre
            // node. All pre nodes are static roots, so we can use this as a
			// location to
            // wrap a state change and reset it upon exiting the pre node.
            var originalPreState = state.pre;
            if (el.pre) {
                state.pre = el.pre;
            }
            state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
            state.pre = originalPreState;
            return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
        }

        // v-once
        function genOnce(el, state) {
            el.onceProcessed = true;
            if (el.if && !el.ifProcessed) {
                return genIf(el, state)
            } else if (el.staticInFor) {
                var key = '';
                var parent = el.parent;
                while (parent) {
                    if (parent.for) {
                        key = parent.key;
                        break
                    }
                    parent = parent.parent;
                }
                if (!key) {
                    state.warn(
                        "v-once can only be used inside v-for that is keyed. ",
                        el.rawAttrsMap['v-once']);
                    return genElement(el, state)
                }
                return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
            } else {
                return genStatic(el, state)
            }
        }

        function genIf(
            el,
            state,
            altGen,
            altEmpty) {
            el.ifProcessed = true; // avoid recursion
            return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
        }

        function genIfConditions(
            conditions,
            state,
            altGen,
            altEmpty) {
            if (!conditions.length) {
                return altEmpty || '_e()'
            }

            var condition = conditions.shift();
            if (condition.exp) {
                return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
            } else {
                return ("" + (genTernaryExp(condition.block)))
            }

            // v-if with v-once should generate code like (a)?_m(0):_m(1)
            function genTernaryExp(el) {
                return altGen
                 ? altGen(el, state)
                 : el.once
                 ? genOnce(el, state)
                 : genElement(el, state)
            }
        }

        function genFor(
            el,
            state,
            altGen,
            altHelper) {
            var exp = el.for;
            var alias = el.alias;
            var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
            var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';

            if (state.maybeComponent(el) &&
                el.tag !== 'slot' &&
                el.tag !== 'template' &&
                !el.key) {
                state.warn(
                    "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
                    "v-for should have explicit keys. " +
                    "See https://vuejs.org/guide/list.html#key for more info.",
                    el.rawAttrsMap['v-for'],
                    true /* tip */);
            }

            el.forProcessed = true; // avoid recursion
            return (altHelper || '_l') + "((" + exp + ")," +
            "function(" + alias + iterator1 + iterator2 + "){" +
            "return " + ((altGen || genElement)(el, state)) +
            '})'
        }

        function genData$2(el, state) {
            var data = '{';

            // directives first.
            // directives may mutate the el's other properties before they are
            // generated.
            var dirs = genDirectives(el, state);
            if (dirs) {
                data += dirs + ',';
            }

            // key
            if (el.key) {
                data += "key:" + (el.key) + ",";
            }
            // ref
            if (el.ref) {
                data += "ref:" + (el.ref) + ",";
            }
            if (el.refInFor) {
                data += "refInFor:true,";
            }
            // pre
            if (el.pre) {
                data += "pre:true,";
            }
            // record original tag name for components using "is" attribute
            if (el.component) {
                data += "tag:\"" + (el.tag) + "\",";
            }
            // module data generation functions
            for (var i = 0; i < state.dataGenFns.length; i++) {
                data += state.dataGenFns[i](el);
            }
            // attributes
            if (el.attrs) {
                data += "attrs:" + (genProps(el.attrs)) + ",";
            }
            // DOM props
            if (el.props) {
                data += "domProps:" + (genProps(el.props)) + ",";
            }
            // event handlers
            if (el.events) {
                data += (genHandlers(el.events, false)) + ",";
            }
            if (el.nativeEvents) {
                data += (genHandlers(el.nativeEvents, true)) + ",";
            }
            // slot target
            // only for non-scoped slots
            if (el.slotTarget && !el.slotScope) {
                data += "slot:" + (el.slotTarget) + ",";
            }
            // scoped slots
            if (el.scopedSlots) {
                data += (genScopedSlots(el, el.scopedSlots, state)) + ",";
            }
            // component v-model
            if (el.model) {
                data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
            }
            // inline-template
            if (el.inlineTemplate) {
                var inlineTemplate = genInlineTemplate(el, state);
                if (inlineTemplate) {
                    data += inlineTemplate + ",";
                }
            }
            data = data.replace(/,$/, '') + '}';
            // v-bind dynamic argument wrap
            // v-bind with dynamic arguments must be applied using the same
			// v-bind
            // object
            // merge helper so that class/style/mustUseProp attrs are handled
			// correctly.
            if (el.dynamicAttrs) {
                data = "_b(" + data + ",\"" + (el.tag) + "\"," + (genProps(el.dynamicAttrs)) + ")";
            }
            // v-bind data wrap
            if (el.wrapData) {
                data = el.wrapData(data);
            }
            // v-on data wrap
            if (el.wrapListeners) {
                data = el.wrapListeners(data);
            }
            return data
        }

        function genDirectives(el, state) {
            var dirs = el.directives;
            if (!dirs) {
                return
            }
            var res = 'directives:[';
            var hasRuntime = false;
            var i,
            l,
            dir,
            needRuntime;
            for (i = 0, l = dirs.length; i < l; i++) {
                dir = dirs[i];
                needRuntime = true;
                var gen = state.directives[dir.name];
                if (gen) {
                    // compile-time directive that manipulates AST.
                    // returns true if it also needs a runtime counterpart.
                    needRuntime = !!gen(el, dir, state.warn);
                }
                if (needRuntime) {
                    hasRuntime = true;
                    res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:" + (dir.isDynamicArg ? dir.arg : ("\"" + (dir.arg) + "\""))) : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
                }
            }
            if (hasRuntime) {
                return res.slice(0, -1) + ']'
            }
        }

        function genInlineTemplate(el, state) {
            var ast = el.children[0];
            if (el.children.length !== 1 || ast.type !== 1) {
                state.warn(
                    'Inline-template components must have exactly one child element.', {
                    start: el.start
                });
            }
            if (ast && ast.type === 1) {
                var inlineRenderFns = generate(ast, state.options);
                return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function (code) {
                            return ("function(){" + code + "}");
                        }).join(',')) + "]}")
            }
        }

        function genScopedSlots(
            el,
            slots,
            state) {
            // by default scoped slots are considered "stable", this allows
			// child
            // components with only scoped slots to skip forced updates from
			// parent.
            // but in some cases we have to bail-out of this optimization
            // for example if the slot contains dynamic names, has v-if or v-for
			// on
            // them...
            var needsForceUpdate = el.for || Object.keys(slots).some(function (key) {
                    var slot = slots[key];
                    return (
                        slot.slotTargetDynamic ||
                        slot.if ||
                        slot.for ||
                        containsSlotChild(slot) // is passing down slot from
												// parent which may be
                        // dynamic
                    )
                });

            // #9534: if a component with scoped slots is inside a conditional
			// branch,
            // it's possible for the same component to be reused but with
			// different
            // compiled slot content. To avoid that, we generate a unique key
			// based on
            // the generated code of all the slot contents.
            var needsKey = !!el.if;

            // OR when it is inside another scoped slot or v-for (the reactivity
			// may be
            // disconnected due to the intermediate scope variable)
            // #9438, #9506
            // TODO: this can be further optimized by properly analyzing
			// in-scope
            // bindings
            // and skip force updating ones that do not actually use scope
			// variables.
            if (!needsForceUpdate) {
                var parent = el.parent;
                while (parent) {
                    if (
                        (parent.slotScope && parent.slotScope !== emptySlotScopeToken) ||
                        parent.for) {
                        needsForceUpdate = true;
                        break
                    }
                    if (parent.if) {
                        needsKey = true;
                    }
                    parent = parent.parent;
                }
            }

            var generatedSlots = Object.keys(slots)
                .map(function (key) {
                    return genScopedSlot(slots[key], state);
                })
                .join(',');

            return ("scopedSlots:_u([" + generatedSlots + "]" + (needsForceUpdate ? ",null,true" : "") + (!needsForceUpdate && needsKey ? (",null,false," + (hash(generatedSlots))) : "") + ")")
        }

        function hash(str) {
            var hash = 5381;
            var i = str.length;
            while (i) {
                hash = (hash * 33) ^ str.charCodeAt(--i);
            }
            return hash >>> 0
        }

        function containsSlotChild(el) {
            if (el.type === 1) {
                if (el.tag === 'slot') {
                    return true
                }
                return el.children.some(containsSlotChild)
            }
            return false
        }

        function genScopedSlot(
            el,
            state) {
            var isLegacySyntax = el.attrsMap['slot-scope'];
            if (el.if && !el.ifProcessed && !isLegacySyntax) {
                return genIf(el, state, genScopedSlot, "null")
            }
            if (el.for && !el.forProcessed) {
                return genFor(el, state, genScopedSlot)
            }
            var slotScope = el.slotScope === emptySlotScopeToken
                 ? ""
                 : String(el.slotScope);
            var fn = "function(" + slotScope + "){" +
                "return " + (el.tag === 'template'
                     ? el.if && isLegacySyntax
                     ? ("(" + (el.if) + ")?" + (genChildren(el, state) || 'undefined') + ":undefined")
                     : genChildren(el, state) || 'undefined'
                     : genElement(el, state)) + "}";
            // reverse proxy v-slot without scope on this.$slots
            var reverseProxy = slotScope ? "" : ",proxy:true";
            return ("{key:" + (el.slotTarget || "\"default\"") + ",fn:" + fn + reverseProxy + "}")
        }

        function genChildren(
            el,
            state,
            checkSkip,
            altGenElement,
            altGenNode) {
            var children = el.children;
            if (children.length) {
                var el$1 = children[0];
                // optimize single v-for
                if (children.length === 1 &&
                    el$1.for &&
                    el$1.tag !== 'template' &&
                    el$1.tag !== 'slot') {
                    var normalizationType = checkSkip
                         ? state.maybeComponent(el$1) ? ",1" : ",0"
                         : "";
                    return ("" + ((altGenElement || genElement)(el$1, state)) + normalizationType)
                }
                var normalizationType$1 = checkSkip
                     ? getNormalizationType(children, state.maybeComponent)
                     : 0;
                var gen = altGenNode || genNode;
                return ("[" + (children.map(function (c) {
                            return gen(c, state);
                        }).join(',')) + "]" + (normalizationType$1 ? ("," + normalizationType$1) : ''))
            }
        }

        // determine the normalization needed for the children array.
        // 0: no normalization needed
        // 1: simple normalization needed (possible 1-level deep nested array)
        // 2: full normalization needed
        function getNormalizationType(
            children,
            maybeComponent) {
            var res = 0;
            for (var i = 0; i < children.length; i++) {
                var el = children[i];
                if (el.type !== 1) {
                    continue
                }
                if (needsNormalization(el) ||
                    (el.ifConditions && el.ifConditions.some(function (c) {
                            return needsNormalization(c.block);
                        }))) {
                    res = 2;
                    break
                }
                if (maybeComponent(el) ||
                    (el.ifConditions && el.ifConditions.some(function (c) {
                            return maybeComponent(c.block);
                        }))) {
                    res = 1;
                }
            }
            return res
        }

        function needsNormalization(el) {
            return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
        }

        function genNode(node, state) {
            if (node.type === 1) {
                return genElement(node, state)
            } else if (node.type === 3 && node.isComment) {
                return genComment(node)
            } else {
                return genText(node)
            }
        }

        function genText(text) {
            return ("_v(" + (text.type === 2
                     ? text.expression // no need for () because already
										// wrapped in _s()
                     : transformSpecialNewlines(JSON.stringify(text.text))) + ")")
        }

        function genComment(comment) {
            return ("_e(" + (JSON.stringify(comment.text)) + ")")
        }

        function genSlot(el, state) {
            var slotName = el.slotName || '"default"';
            var children = genChildren(el, state);
            var res = "_t(" + slotName + (children ? ("," + children) : '');
            var attrs = el.attrs || el.dynamicAttrs
                 ? genProps((el.attrs || []).concat(el.dynamicAttrs || []).map(function (attr) {
                        return ({
                            // slot props are camelized
                            name: camelize(attr.name),
                            value: attr.value,
                            dynamic: attr.dynamic
                        });
                    }))
                 : null;
            var bind$$1 = el.attrsMap['v-bind'];
            if ((attrs || bind$$1) && !children) {
                res += ",null";
            }
            if (attrs) {
                res += "," + attrs;
            }
            if (bind$$1) {
                res += (attrs ? '' : ',null') + "," + bind$$1;
            }
            return res + ')'
        }

        // componentName is el.component, take it as argument to shun flow's
        // pessimistic refinement
        function genComponent(
            componentName,
            el,
            state) {
            var children = el.inlineTemplate ? null : genChildren(el, state, true);
            return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
        }

        function genProps(props) {
            var staticProps = "";
            var dynamicProps = "";
            for (var i = 0; i < props.length; i++) {
                var prop = props[i];
                var value = transformSpecialNewlines(prop.value);
                if (prop.dynamic) {
                    dynamicProps += (prop.name) + "," + value + ",";
                } else {
                    staticProps += "\"" + (prop.name) + "\":" + value + ",";
                }
            }
            staticProps = "{" + (staticProps.slice(0, -1)) + "}";
            if (dynamicProps) {
                return ("_d(" + staticProps + ",[" + (dynamicProps.slice(0, -1)) + "])")
            } else {
                return staticProps
            }
        }

        // #3895, #4268
        function transformSpecialNewlines(text) {
            return text
            .replace(/\u2028/g, '\\u2028')
            .replace(/\u2029/g, '\\u2029')
        }

        /*  */

        // these keywords should not appear inside expressions, but operators
		// like
        // typeof, instanceof and in are allowed
        var prohibitedKeywordRE = new RegExp('\\b' + (
                    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
                    'super,throw,while,yield,delete,export,import,return,switch,default,' +
                    'extends,finally,continue,debugger,function,arguments').split(',').join('\\b|\\b') + '\\b');

        // these unary operators should not be used as property/method names
        var unaryOperatorsRE = new RegExp('\\b' + (
                    'delete,typeof,void').split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');

        // strip strings in expressions
        var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

        // detect problematic expressions in a template
        function detectErrors(ast, warn) {
            if (ast) {
                checkNode(ast, warn);
            }
        }

        function checkNode(node, warn) {
            if (node.type === 1) {
                for (var name in node.attrsMap) {
                    if (dirRE.test(name)) {
                        var value = node.attrsMap[name];
                        if (value) {
                            var range = node.rawAttrsMap[name];
                            if (name === 'v-for') {
                                checkFor(node, ("v-for=\"" + value + "\""), warn, range);
                            } else if (name === 'v-slot' || name[0] === '#') {
                                checkFunctionParameterExpression(value, (name + "=\"" + value + "\""), warn, range);
                            } else if (onRE.test(name)) {
                                checkEvent(value, (name + "=\"" + value + "\""), warn, range);
                            } else {
                                checkExpression(value, (name + "=\"" + value + "\""), warn, range);
                            }
                        }
                    }
                }
                if (node.children) {
                    for (var i = 0; i < node.children.length; i++) {
                        checkNode(node.children[i], warn);
                    }
                }
            } else if (node.type === 2) {
                checkExpression(node.expression, node.text, warn, node);
            }
        }

        function checkEvent(exp, text, warn, range) {
            var stripped = exp.replace(stripStringRE, '');
            var keywordMatch = stripped.match(unaryOperatorsRE);
            if (keywordMatch && stripped.charAt(keywordMatch.index - 1) !== '$') {
                warn(
                    "avoid using JavaScript unary operator as property name: " +
                    "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim()),
                    range);
            }
            checkExpression(exp, text, warn, range);
        }

        function checkFor(node, text, warn, range) {
            checkExpression(node.for || '', text, warn, range);
            checkIdentifier(node.alias, 'v-for alias', text, warn, range);
            checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range);
            checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range);
        }

        function checkIdentifier(
            ident,
            type,
            text,
            warn,
            range) {
            if (typeof ident === 'string') {
                try {
                    new Function(("var " + ident + "=_"));
                } catch (e) {
                    warn(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())), range);
                }
            }
        }

        function checkExpression(exp, text, warn, range) {
            try {
                new Function(("return " + exp));
            } catch (e) {
                var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
                if (keywordMatch) {
                    warn(
                        "avoid using JavaScript keyword as property name: " +
                        "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim()),
                        range);
                } else {
                    warn(
                        "invalid expression: " + (e.message) + " in\n\n" +
                        "    " + exp + "\n\n" +
                        "  Raw expression: " + (text.trim()) + "\n",
                        range);
                }
            }
        }

        function checkFunctionParameterExpression(exp, text, warn, range) {
            try {
                new Function(exp, '');
            } catch (e) {
                warn(
                    "invalid function parameter expression: " + (e.message) + " in\n\n" +
                    "    " + exp + "\n\n" +
                    "  Raw expression: " + (text.trim()) + "\n",
                    range);
            }
        }

        /*  */

        var range = 2;

        function generateCodeFrame(
            source,
            start,
            end) {
            if (start === void 0)
                start = 0;
            if (end === void 0)
                end = source.length;

            var lines = source.split(/\r?\n/);
            var count = 0;
            var res = [];
            for (var i = 0; i < lines.length; i++) {
                count += lines[i].length + 1;
                if (count >= start) {
                    for (var j = i - range; j <= i + range || end > count; j++) {
                        if (j < 0 || j >= lines.length) {
                            continue
                        }
                        res.push(("" + (j + 1) + (repeat$1(" ", 3 - String(j + 1).length)) + "|  " + (lines[j])));
                        var lineLength = lines[j].length;
                        if (j === i) {
                            // push underline
                            var pad = start - (count - lineLength) + 1;
                            var length = end > count ? lineLength - pad : end - start;
                            res.push("   |  " + repeat$1(" ", pad) + repeat$1("^", length));
                        } else if (j > i) {
                            if (end > count) {
                                var length$1 = Math.min(end - count, lineLength);
                                res.push("   |  " + repeat$1("^", length$1));
                            }
                            count += lineLength + 1;
                        }
                    }
                    break
                }
            }
            return res.join('\n')
        }

        function repeat$1(str, n) {
            var result = '';
            if (n > 0) {
                while (true) { // eslint-disable-line
                    if (n & 1) {
                        result += str;
                    }
                    n >>>= 1;
                    if (n <= 0) {
                        break
                    }
                    str += str;
                }
            }
            return result
        }

        /*  */

        function createFunction(code, errors) {
            try {
                return new Function(code)
            } catch (err) {
                errors.push({
                    err: err,
                    code: code
                });
                return noop
            }
        }

        function createCompileToFunctionFn(compile) {
            var cache = Object.create(null);

            return function compileToFunctions(
                template,
                options,
                vm) {
                options = extend({}, options);
                var warn$$1 = options.warn || warn;
                delete options.warn;

                /* istanbul ignore if */
                {
                    // detect possible CSP restriction
                    try {
                        new Function('return 1');
                    } catch (e) {
                        if (e.toString().match(/unsafe-eval|CSP/)) {
                            warn$$1(
                                'It seems you are using the standalone build of Vue.js in an ' +
                                'environment with Content Security Policy that prohibits unsafe-eval. ' +
                                'The template compiler cannot work in this environment. Consider ' +
                                'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                                'templates into render functions.');
                        }
                    }
                }

                // check cache
                var key = options.delimiters
                     ? String(options.delimiters) + template
                     : template;
                if (cache[key]) {
                    return cache[key]
                }

                // compile
                var compiled = compile(template, options);

                // check compilation errors/tips
                {
                    if (compiled.errors && compiled.errors.length) {
                        if (options.outputSourceRange) {
                            compiled.errors.forEach(function (e) {
                                warn$$1(
                                    "Error compiling template:\n\n" + (e.msg) + "\n\n" +
                                    generateCodeFrame(template, e.start, e.end),
                                    vm);
                            });
                        } else {
                            warn$$1(
                                "Error compiling template:\n\n" + template + "\n\n" +
                                compiled.errors.map(function (e) {
                                    return ("- " + e);
                                }).join('\n') + '\n',
                                vm);
                        }
                    }
                    if (compiled.tips && compiled.tips.length) {
                        if (options.outputSourceRange) {
                            compiled.tips.forEach(function (e) {
                                return tip(e.msg, vm);
                            });
                        } else {
                            compiled.tips.forEach(function (msg) {
                                return tip(msg, vm);
                            });
                        }
                    }
                }

                // turn code into functions
                var res = {};
                var fnGenErrors = [];
                res.render = createFunction(compiled.render, fnGenErrors);
                res.staticRenderFns = compiled.staticRenderFns.map(function (code) {
                        return createFunction(code, fnGenErrors)
                    });

                // check function generation errors.
                // this should only happen if there is a bug in the compiler
				// itself.
                // mostly for codegen development use
                /* istanbul ignore if */
                {
                    if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                        warn$$1(
                            "Failed to generate render function:\n\n" +
                            fnGenErrors.map(function (ref) {
                                var err = ref.err;
                                var code = ref.code;

                                return ((err.toString()) + " in\n\n" + code + "\n");
                            }).join('\n'),
                            vm);
                    }
                }

                return (cache[key] = res)
            }
        }

        /*  */

        function createCompilerCreator(baseCompile) {
            return function createCompiler(baseOptions) {
                function compile(
                    template,
                    options) {
                    var finalOptions = Object.create(baseOptions);
                    var errors = [];
                    var tips = [];

                    var warn = function (msg, range, tip) {
                        (tip ? tips : errors).push(msg);
                    };

                    if (options) {
                        if (options.outputSourceRange) {
                            // $flow-disable-line
                            var leadingSpaceLength = template.match(/^\s*/)[0].length;

                            warn = function (msg, range, tip) {
                                var data = {
                                    msg: msg
                                };
                                if (range) {
                                    if (range.start != null) {
                                        data.start = range.start + leadingSpaceLength;
                                    }
                                    if (range.end != null) {
                                        data.end = range.end + leadingSpaceLength;
                                    }
                                }
                                (tip ? tips : errors).push(data);
                            };
                        }
                        // merge custom modules
                        if (options.modules) {
                            finalOptions.modules =
                                (baseOptions.modules || []).concat(options.modules);
                        }
                        // merge custom directives
                        if (options.directives) {
                            finalOptions.directives = extend(
                                    Object.create(baseOptions.directives || null),
                                    options.directives);
                        }
                        // copy other options
                        for (var key in options) {
                            if (key !== 'modules' && key !== 'directives') {
                                finalOptions[key] = options[key];
                            }
                        }
                    }

                    finalOptions.warn = warn;

                    var compiled = baseCompile(template.trim(), finalOptions);{
                        detectErrors(compiled.ast, warn);
                    }
                    compiled.errors = errors;
                    compiled.tips = tips;
                    return compiled
                }

                return {
                    compile: compile,
                    compileToFunctions: createCompileToFunctionFn(compile)
                }
            }
        }

        /*  */

        // `createCompilerCreator` allows creating compilers that use
		// alternative
        // parser/optimizer/codegen, e.g the SSR optimizing compiler.
        // Here we just export a default compiler using the default parts.
        var createCompiler = createCompilerCreator(function baseCompile(
                    template,
                    options) {
                var ast = parse(template.trim(), options);
                if (options.optimize !== false) {
                    optimize(ast, options);
                }
                var code = generate(ast, options);
                return {
                    ast: ast,
                    render: code.render,
                    staticRenderFns: code.staticRenderFns
                }
            });

        /*  */

        var ref$1 = createCompiler(baseOptions);
        var compile = ref$1.compile;
        var compileToFunctions = ref$1.compileToFunctions;

        /*  */

        // check whether current browser encodes a char inside attribute values
        var div;
        function getShouldDecode(href) {
            div = div || document.createElement('div');
            div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
            return div.innerHTML.indexOf('&#10;') > 0
        }

        // #3663: IE encodes newlines inside attribute values while other
		// browsers
        // don't
        var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
        // #6828: chrome encodes content in a[href]
        var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;

        /*  */

        var idToTemplate = cached(function (id) {
                var el = query(id);
                return el && el.innerHTML
            });

        var mount = Vue.prototype.$mount;
        Vue.prototype.$mount = function (
            el,
            hydrating) {
            el = el && query(el);

            /* istanbul ignore if */
            if (el === document.body || el === document.documentElement) {
                warn(
                    "Do not mount Vue to <html> or <body> - mount to normal elements instead.");
                return this
            }

            var options = this.$options;
            // resolve template/el and convert to render function
            if (!options.render) {
                var template = options.template;
                if (template) {
                    if (typeof template === 'string') {
                        if (template.charAt(0) === '#') {
                            template = idToTemplate(template);
                            /* istanbul ignore if */
                            if (!template) {
                                warn(
                                    ("Template element not found or is empty: " + (options.template)),
                                    this);
                            }
                        }
                    } else if (template.nodeType) {
                        template = template.innerHTML;
                    } else { {
                            warn('invalid template option:' + template, this);
                        }
                        return this
                    }
                } else if (el) {
                    template = getOuterHTML(el);
                }
                if (template) {
                    /* istanbul ignore if */
                    if (config.performance && mark) {
                        mark('compile');
                    }

                    var ref = compileToFunctions(template, {
                            outputSourceRange: "development" !== 'production',
                            shouldDecodeNewlines: shouldDecodeNewlines,
                            shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
                            delimiters: options.delimiters,
                            comments: options.comments
                        }, this);
                    var render = ref.render;
                    var staticRenderFns = ref.staticRenderFns;
                    options.render = render;
                    options.staticRenderFns = staticRenderFns;

                    /* istanbul ignore if */
                    if (config.performance && mark) {
                        mark('compile end');
                        measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
                    }
                }
            }
            return mount.call(this, el, hydrating)
        };

        /**
		 * Get outerHTML of elements, taking care of SVG elements in IE as well.
		 */
        function getOuterHTML(el) {
            if (el.outerHTML) {
                return el.outerHTML
            } else {
                var container = document.createElement('div');
                container.appendChild(el.cloneNode(true));
                return container.innerHTML
            }
        }

        Vue.compile = compileToFunctions;

        return Vue;

    }));